Recommended Flat Towing Setup for a 2018 Ford F-150 w/ a Motorhome that has Air Brakes
Updated 07/25/2025 | Published 07/24/2025
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Question:
The SMI duo brake system says it's for RVs with hydraulic brakes. What about for RVs with Air Brakes (2019 Tiffin AB40ip) when towing a 2018 F-150 Lariat?
asked by: Mike H
Expert Reply:
Hey Mike, welcome back. For RV's with air brakes, you'll want the Demco Air Force One Flat Tow Brake System for RVs w/ Air Brakes - item # SM99243. This system uses the air pressure from your Tiffin's brake line to apply your F-150's brakes at the same time, with the same intensity.
Here are the rest of the parts you'll need to flat tow your 2018 Ford F-150 Lariat:
Tow Bar and Safety Chains - etrailer XHD Non-Binding Tow Bar for Roadmaster Direct-Connect Base Plate item # e84ZR
Base Plate Kit - Roadmaster Direct-Connect Base Plate Kit - Removable Arms item # RM-524431-5
Wiring Harness - Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit item # RM-15267
Charge Line - Roadmaster Battery Charge Line Kit for Towed Vehicles item # RM-156-25
Brake Light Switch - Roadmaster Brake-Lite Relay Kit for Towed Vehicles item # RM-88400
High Low Adapter - The tow bar needs to be within 3" of level. If you measure the height of the inside top of the hitch receiver tube on your RV, and the height difference is more than 3 inches above/below the base plate tab height, you'll need a high/low adapter. I have linked a FAQ article that explains all this in more detail along with our selection of adapters.
Have you ever flat towed before and does your Tiffin have a hitch?
Product Page this Question was Asked From
Demco Stay-IN-Play Duo Flat Tow Brake System for RVs w/ Hydraulic Brakes - Proportional
- Flat Tow Brake System
- Brake Systems
- Proportional System
- One-Time Setup
- Vehicle Battery
- Fixed System
- Power Assist Brake Compatible
- Hydraulic Brakes
- Indicator Lights
- Demco
more information >
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Mike H.
7/24/2025
Thanks! I have not flat towed before, although I have lots of towing experience with a variety of trailers up to 10,000 lbs. Out Tiffin has a hitch, 7 wire plug, and an airline with a quick-disconnect fitting already there at the hitch. Also has a prodigy brake controller so I assume the PO towed something back there.