Towing your daily driver or off-road rig behind a motorhome offers the ultimate freedom to explore deep into the backcountry without moving your entire camp. Many enthusiasts prefer this method because it eliminates the need for a bulky trailer or a heavy tow dolly once you reach your destination.
However, learning how to flat tow a car correctly is essential for protecting your vehicle’s transmission and ensuring the safety of everyone on the highway. If done improperly, you risk catastrophic mechanical failure or dangerous swaying while at high speeds.
In this guide, we will walk you through the essential equipment, vehicle compatibility checks, and the step-by-step process to get you on the road with confidence. We’ll cover everything from base plates to supplemental braking systems so you can enjoy the journey worry-free.
Understanding the Basics of Flat Towing
Flat towing, often referred to as “dinghy towing” or “four-down towing,” involves pulling a vehicle with all four of its wheels touching the pavement. It is the most popular method for RVers because of how quickly you can connect and disconnect the vehicle.
Unlike using a trailer, flat towing doesn’t require extra storage space at your campsite or home. You simply unhook the tow bar, and your vehicle is ready to drive, making it perfect for weekend warriors and full-time travelers alike.
However, not every vehicle is a candidate for this setup. Before you buy any gear, you must verify that your car’s drivetrain can handle being towed without the engine running to circulate lubricants through the transmission.
Is Your Vehicle Flat Towable?
The first step is checking your owner’s manual under the “Recreational Towing” section. Manufacturers explicitly state whether a model can be towed four-down and what specific steps are required to prevent damage.
Generally, vehicles with a manual transmission or those with a four-wheel-drive system that features a manual transfer case with a neutral position are the best candidates. Many modern automatics and CVTs cannot be flat towed because the pump that cools the transmission only runs when the engine is on.
If your vehicle isn’t naturally towable, you might need to install a lubrication pump or a driveshaft disconnect. These modifications can be complex and expensive, so most owners choose a vehicle that is factory-ready for dinghy towing.
The Essential Hardware for a Safe Setup
To safely tow your vehicle, you need a system of components working in harmony. You cannot simply use a rope or a generic chain; you need specialized hardware designed to handle the stresses of highway speeds and emergency maneuvers.
Each piece of equipment plays a specific role in steering, stopping, and securing the towed vehicle. Investing in high-quality components from reputable brands is the best way to ensure long-term reliability and peace of mind on the trail.
The Base Plate Kit
The base plate is the foundation of your towing setup. It is a custom-engineered steel bracket that bolts directly to the frame or chassis of your towed vehicle, providing a secure attachment point for the tow bar.
Unlike a universal bumper mount, a base plate is designed to distribute the towing forces evenly across the vehicle’s structure. Most modern base plates feature removable tabs, so your car doesn’t look like a tow vehicle when you’re driving it around town.
The Tow Bar
The tow bar is the link between your motorhome’s hitch and the car’s base plate. There are two main types: motorhome-mounted and vehicle-mounted tow bars. Motorhome-mounted versions are generally preferred because they stay on the RV and are easier to align.
Look for a non-binding tow bar. These models allow you to unhook the vehicle even when it is not on perfectly level ground. This feature is a lifesaver when you’re at a crowded off-road trailhead or a cramped gas station.
Safety Cables and Wiring
Safety cables are your secondary defense. If the tow bar fails or uncouples, these cables keep the vehicle attached to the motorhome. Always criss-cross them under the tow bar to create a “cradle” that prevents the tow bar from digging into the pavement.
You also need a wiring kit to operate the towed vehicle’s brake lights and turn signals. You can choose between permanent diode kits, which use your car’s factory lights, or magnetic towing lights that you stick on the roof or trunk for temporary use.
How to Flat Tow a Car
Once you have all your equipment installed, the actual process of hooking up requires a disciplined routine. Missing a single step, like forgetting to unlock the steering wheel, can lead to tire scrubbing or a broken tow bar.
Start by parking the motorhome and the towed vehicle on a flat, level surface. It is much easier to align the tow bar when you aren’t fighting gravity or awkward angles. Ensure the motorhome’s parking brake is firmly engaged before you begin.
- Align the Vehicle: Drive the car behind the motorhome, centering it as much as possible. Stop about two to three feet behind the hitch.
- Connect the Tow Bar: Extend the arms of the tow bar and attach them to the base plate pins. Secure them with the provided linchpins and safety clips.
- Attach Safety Cables: Connect the safety cables in a criss-cross pattern. Ensure they have enough slack for turns but aren’t dragging on the ground.
- Plug in the Electrics: Connect the umbilical cord between the RV and the car. Test the turn signals and brake lights to ensure they are synchronized.
- Set the Transmission: This is the most critical step. Follow your manual’s specific sequence to put the transmission or transfer case into “Neutral.”
- Unlock the Steering: Most vehicles require the ignition to be in the “Accessory” position so the front wheels can turn freely with the motorhome.
After everything is connected, pull the motorhome forward slowly. Have a spotter watch the tow bar arms to ensure they lock into place. Once locked, double-check that the car is rolling freely and the steering wheel is moving in response to the RV’s direction.
The Importance of Supplemental Braking Systems
In many jurisdictions, it is illegal to tow a vehicle over a certain weight without a supplemental braking system. Even if it isn’t legally required in your area, it is a critical safety upgrade that every DIYer should prioritize.
When you hit the brakes on your motorhome, the weight of the towed car wants to keep moving forward. This pushes against the RV, significantly increasing your stopping distance and potentially causing the car to jackknife in a panic stop.
Portable vs. Installed Systems
Portable braking systems, like the BrakeBuddy, sit on the floorboard of the towed car and push the brake pedal using an air cylinder or electric motor. These are great if you switch between different towed vehicles frequently.
Installed systems are hidden under the hood or seat. They tap into the motorhome’s air brakes or use vacuum pumps to provide seamless, proportional braking. These are more convenient for frequent travelers as they require almost no setup time once installed.
The Breakaway Switch
Every braking system should include a breakaway switch. This is a small device mounted to the front of the car with a thin cable attached to the RV. If the car ever becomes completely detached, the cable pulls a pin, and the car’s brakes lock up instantly.
This prevents a “runaway vehicle” scenario which could be deadly for other drivers. Always test your breakaway switch before a long trip by pulling the pin manually to see if the brakes engage as intended.
Addressing Common Challenges and Pitfalls
Even with the best gear, flat towing presents unique challenges. One common issue is battery drain. Since many cars require the ignition to be in the “ACC” position to keep the steering unlocked, the car’s electronics can drain the battery over several hours of driving.
To solve this, you can install a charge line kit. This simple wire allows the motorhome’s alternator to send a small maintenance charge to the car’s battery while you’re driving. This ensures your car starts right up when you reach the campsite.
The Infamous “Death Wobble”
Some vehicles, particularly certain models of Jeeps and SUVs with solid front axles, can experience a violent front-end shaking known as the “death wobble” while being towed. This is often caused by a combination of road vibration and steering geometry.
If you experience this, you must stop immediately. Usually, installing a heavy-duty steering stabilizer or a specialized wiring harness that keeps the electronic power steering active can mitigate this risk. Always consult with other owners of your specific vehicle model to see if they’ve encountered this issue.
Managing Tire Wear
Because the towed vehicle’s odometer usually doesn’t click over while flat towing, it’s easy to forget that the tires are still racking up miles. Check your tire pressure frequently, as low pressure can cause excessive heat and leads to blowouts.
You should also rotate the tires on your towed vehicle more frequently than you would during normal driving. The alignment of a towed vehicle isn’t always perfect, and frequent highway miles can cause uneven tread wear if you aren’t diligent.
Safety Checklists for the Road
Before you pull out of your driveway, perform a “walk-around” inspection. Check every pin, clip, and cable. It only takes a second for a linchpin to vibrate loose if it wasn’t seated correctly, which could lead to a major accident.
During your trip, make it a habit to check the towed vehicle every time you stop for fuel or a rest break. Touch the tires and hubs of the car to feel for excessive heat, which could indicate a dragging brake or a bearing issue.
- Check the Hitch: Ensure the receiver pin is secure and the tow bar is level.
- Verify Lights: Have a partner stand behind the car while you cycle the signals.
- Monitor the Monitor: If your braking system has an in-cab monitor, ensure it shows a “ready” status.
- Tighten Everything: Use your hands to pull on the safety cables and tow bar to ensure there is no unusual play.
Remember that your turning radius is much wider when flat towing. Avoid backing up at all costs; most tow bars are not designed to handle reverse forces and will bend or bind instantly. If you get into a tight spot, it is always safer to unhook the car, move both vehicles separately, and then re-hook.
Frequently Asked Questions About How to Flat Tow a Car
Does flat towing add miles to my odometer?
On most modern vehicles with digital odometers, flat towing does not add miles because the ignition is not in the “On” position and the vehicle’s computer is not recording distance. However, older vehicles with mechanical speedometers will likely track the mileage.
Can I flat tow an automatic transmission car?
It depends entirely on the specific model. While many automatics cannot be towed four-down, some are designed with internal pumps that allow for it. Always verify this in your owner’s manual to avoid destroying your transmission.
Do I need a special driver’s license to flat tow?
In most U.S. states and Canadian provinces, a standard driver’s license is sufficient for flat towing a passenger vehicle behind an RV. However, you must still adhere to weight limits and braking requirements specific to each jurisdiction you travel through.
What happens if I try to back up while flat towing?
Backing up even a few feet can cause the front wheels of the towed car to turn sharply to one side. This puts immense pressure on the tow bar and base plate, often resulting in bent hardware or damage to the car’s steering components.
Is flat towing better than using a tow dolly?
Flat towing is generally considered superior because it is faster to set up and doesn’t require storing a bulky dolly. However, a tow dolly is a better option for front-wheel-drive vehicles that are not factory-approved for four-down towing.
Conclusion: Ready for the Open Road
Mastering how to flat tow a car is one of the most rewarding skills for any automotive enthusiast or traveler. It transforms your travel experience, giving you the mobility to explore narrow mountain passes or crowded city streets that a massive motorhome simply cannot navigate.
By choosing the right equipment, following a strict safety protocol, and understanding your vehicle’s mechanical limits, you ensure that every trip is as smooth as possible. Always prioritize safety over speed, and don’t be afraid to double-check your connections at every stop.
Whether you are hauling a built Jeep to the rocks or a fuel-efficient commuter to a national park, the right setup makes all the difference. Take your time, do your research, and invest in quality gear that will last for years of adventures.
Stay safe, keep your eyes on the road, and enjoy the freedom of the great outdoors!
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