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
Products Featured in This Question
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 >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Search Results: discounts
- Search Results: rm152
- Shop: Base Plate for Tow Bar
- Shop: Vehicle Tow Bar Wiring
- Shop: Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord
- Article: Flat Towing Package for 2015-2018 Ford F-150
- Video: Best 2018 Ford F-150 Flat Tow Set Up Main Components - Base Plates
- Shop: Roadmaster Guardian Rock Guard for Towed Vehicles
- Shop: Sentry Deflector for Demco and etrailer Tow Bars
- Shop: Demco Tabless Base Plate Kit - Removable Arms
- Video: Installation Guide for the etrailer Invisible Base Plate Kit on a 2018 Ford F-150
- Shop: Roadmaster Direct-Connect Base Plate Kit - Removable Arms
- Shop: etrailer Invisible Base Plate Kit - Removable Arms
- Search Results: tow bar base plate
- Shop: Truck Topper
- Search Results: rm 15267
- Shop: Agri-Cover Outlander Soft Truck Topper
- Search Results: air tubing cutter
- Search Results: rm766
- Search Results: air lines
- Shop: Vehicle Tow Bar Brake System
- Video: An In-Depth Look at the Roadmaster Battery Charge Line Kit for Towed Vehicles
- Video: Mount: Roadmaster Battery Charge Line Kit for Towed Vehicles on a 2018 Chevrolet Silverado 1500
- Q&A: Recommended Parts Needed to Flat Tow a 2015-2018 GMC Canyon or Chevy Colorado
- Q&A: Dinghy Tow Wiring for 2018 Chevy Silverado 1500
- Q&A: All Parts Needed to Flat Tow 2014 Chevy Silverado 1500 Behind Motorhome
- Q&A: Does the Battery on a 2024 Chevy Trax Need to Be Disconnected for Flat Towing
- Q&A: How Does Demco Coachlink Get Wired To Air Force One Braking System?
- Q&A: How To Wire The Reed Switch Of The Demco Air Force One With Coachlink Monitor
- Shop: Trailer Wiring
on Flat Tow Brake System
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.