7 Best Flat Tow Braking Systems (Researched and Compared)

Flat towing (also known as dinghy towing) requires a braking system in the towed vehicle to comply with safety regulations and protect both vehicles. We researched and compared the top systems based on manufacturer specifications, industry safety standards (including FMVSS and RVsafety.com guidelines), and aggregated owner feedback from forums and verified reviews. This guide evaluates performance, durability, ease of use, and value to help you choose the right system for your setup.

1. Blue Ox Patriot 3: Top Pick

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The Blue Ox Patriot 3 is a portable proportional braking system that uses an accelerometer to apply the towed vehicle’s brakes in proportion to the motorhome’s deceleration. In our evaluation, based on owner feedback and the spec sheets, it delivers the most natural braking feel, reducing wear on both vehicles. It fits vehicles up to 3,000 lbs and installs in minutes without tools. The included breakaway system meets safety standards.

However, its premium features come at a higher cost, and some users report the unit can be sensitive to positioning inside the vehicle. It may not be ideal for those on a strict budget or who prefer a permanently installed system. We recommend it for most flat towing setups where ease of use and braking performance are top priorities.

• Proportional braking adjusts force based on deceleration for smooth stops.
• Easy installation with no permanent modifications to the towed vehicle.
• Includes breakaway battery and cable for emergency activation.

Pros: Smooth, natural braking feel; Lightweight and portable
Cons: Higher price point than some competitors

2. Roadmaster Even Brake 9000: Runner Up

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The Roadmaster Even Brake 9000 is a portable proportional braking system that handles up to 5,000 lbs, making it suitable for larger SUVs and trucks. We compared its sensitivity adjustment feature against others and found it allows fine-tuning for different vehicle weights and braking characteristics. Owner feedback highlights its reliability and consistent performance over long trips.

On the downside, some users note that the unit’s positioning in the driver’s footwell can be tricky, and the instructions could be clearer. If you tow a heavier vehicle and want a portable solution, this is a strong choice, but those seeking the simplest installation might prefer the Blue Ox Patriot 3.

• Proportional braking with adjustable sensitivity for different vehicles.
• Compact and lightweight design for easy transfer between vehicles.
• Built-in breakaway system with rechargeable battery.

Pros: Works with heavier vehicles up to 5000 lbs; Adjustable sensitivity
Cons: Installation can be slightly fiddly in tight footwells

3. ReadyBrute Elite Surge Brake: Best Surge System

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The ReadyBrute Elite is a surge braking system that uses the towed vehicle’s momentum to apply its brakes. It integrates the tow bar and braking mechanism, eliminating the need for a separate brake controller. Based on our research and owner feedback, it is a durable, no-fuss solution for those who prefer mechanical systems over electronic ones.

However, surge braking is inherently less smooth than proportional systems, and the unit is heavier (around 60 lbs). It may not be ideal for those who want a portable unit or who drive in stop-and-go traffic where abrupt braking can be a nuisance. We recommend it for budget-conscious towers who value simplicity and durability over perfect braking modulation.

• Combines tow bar and braking system into one unit.
• No need for a separate brake controller in the motorhome.
• Mechanical surge braking: no electronics to fail.

Pros: All-in-one tow bar and brake system; Simple mechanical operation
Cons: Not proportional; braking can be abrupt; Heavier and less portable

4. NSA ReadyBrake: Budget Friendly

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The NSA ReadyBrake is a cable-actuated surge braking system that offers the most budget-friendly entry into flat tow braking. We found that its mechanical simplicity appeals to DIY owners who prefer minimal electronics. It attaches to your existing tow bar and uses a cable to pull the brake pedal when the motorhome decelerates.

However, based on owner feedback, the braking force can be inconsistent, and the system requires the driver to manually lock out the brakes when backing up. It lacks the refinement of proportional systems and may not be suitable for those towing heavy vehicles frequently or in hilly terrain. Consider it only if you are on a tight budget and tow lightweight vehicles occasionally.

• Cable-actuated surge brake: no electronics.
• Works with most tow bars with a separate cable attachment.
• Lowest cost option among major brands.

Pros: Very affordable; Simple mechanical design
Cons: Requires manual engagement/disengagement; Braking can be inconsistent

5. Demco Stay-IN-Play DUO: Permanent Install

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The Demco Stay-IN-Play DUO is a permanently installed proportional braking system that mounts under the hood. In our evaluation, based on manufacturer specs and installer feedback, it offers a clean setup with no clutter in the driver area. It connects to the towed vehicle’s brake system and the motorhome’s electrical system for automatic activation.

However, installation is complex and often requires professional installation, adding to the overall cost. It is not easily transferable to another vehicle, which could be a drawback if you change towed vehicles. We recommend it for owners who have a dedicated towed vehicle and want a permanent, no-hassle solution.

• Permanently installed under the hood, no footwell clutter.
• Proportional braking with electronic control unit.
• Includes breakaway system and battery charger.

Pros: Clean, permanent installation; No setup each time you tow
Cons: Complex installation, may require professional help; Higher cost and not transferable between vehicles

6. Roadmaster InvisiBrake: Invisible Install

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The Roadmaster InvisiBrake is another permanent under-hood system designed for a completely invisible installation. Based on our research and owner reviews, it provides proportional braking and integrates well with the towed vehicle’s systems. It is a premium option for those who want no visible equipment inside the towed vehicle.

However, its high price and installation complexity are significant drawbacks. Some users have reported sensor calibration problems that require dealer visits. It also has a lower value score due to its cost relative to other systems. We recommend it only for owners who prioritize aesthetics and are willing to invest in professional installation and potential maintenance.

• Hidden under-hood installation with no visible components.
• Proportional braking with digital control.
• Compatible with most motorhomes and towed vehicles.

Pros: Very clean installation; Proportional braking
Cons: Expensive and complex install; Some reports of sensor calibration issues

7. SMI Air Force One: Air Brake System

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The SMI Air Force One is designed for motorhomes with air brake systems. It uses the motorhome’s compressed air to actuate the towed vehicle’s brakes proportionally. In our evaluation, based on manufacturer specifications and user feedback, it provides excellent braking modulation and reliability.

However, it is only compatible with air-brake coaches, which limits its audience. The installation is complex and costly, and the system is not portable. We recommend it only for owners of air-brake motorhomes who want a permanent, high-performance braking solution. Others should look at portable proportional systems.

• Uses compressed air from the motorhome's air system (if equipped).
• Proportional braking with air over hydraulic actuation.
• Permanent installation under the hood or in the engine bay.

Pros: Smooth proportional braking; Uses existing air supply
Cons: Only works with motorhomes that have air brakes; Installation is complex and expensive

Frequently Asked Questions

Do I really need a braking system for flat towing?

Yes, most states require a separate braking system for towed vehicles over a certain weight (often 1,500 to 3,000 lbs). Even where not legally required, a braking system is critical for safety, reducing stopping distances and preventing sway. We recommend using a braking system for any flat towed vehicle.

What is the difference between proportional and surge braking?

Proportional braking systems apply the towed vehicle’s brakes in proportion to the motorhome’s deceleration, providing smooth, natural stops. Surge braking uses the towed vehicle’s inertia to activate the brakes, which can be more abrupt and less consistent. Proportional systems are generally preferred for comfort and safety.

Can I install a flat tow braking system myself?

Portable systems like the Blue Ox Patriot 3 and Roadmaster Even Brake are designed for easy DIY installation with no permanent modifications. Permanent under-hood systems often require professional installation due to complexity and safety considerations. Always follow the manufacturer’s instructions and consult a professional if unsure.

How do I know which braking system is compatible with my vehicle?

Check the manufacturer’s specifications for towing capacity and vehicle compatibility. Most systems work with vehicles up to 5,000 lbs. Also ensure the towed vehicle has a brake pedal that can be depressed by the system. Some systems require a specific tow bar or adapter. Contact the manufacturer or a dealer for confirmation.

What is a breakaway system and why is it important?

A breakaway system automatically applies the towed vehicle’s brakes if it becomes disconnected from the motorhome. It is a safety requirement in many states and is included in most quality braking systems. It prevents the towed vehicle from rolling away uncontrolled in the event of a hitch failure.

Our Verdict

After researching and comparing the top flat tow braking systems, our top pick is the Blue Ox Patriot 3 for its excellent proportional braking, ease of use, and portability. The runner up is the Roadmaster Even Brake 9000, which offers similar performance with a higher weight capacity and adjustable sensitivity. For those seeking a permanent installation, the Demco Stay-IN-Play DUO is a solid choice, while budget-conscious buyers may consider the NSA ReadyBrake with the understanding of its limitations.