Best Flat Tow Setup For 2021 Ford F150 With etrailer Base Plate
Updated 09/08/2025 | Published 06/08/2025
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Question:
Hello, i have a 2021 ford f 150 I’m looking to setup to flat tow. I like the invisible e trailer base plate. Can you please let me know what else you’d recommend with this plate? Can you also send me the installation for the wiring harness? I’m just a little confused how that works. Do i need a battery disconnect? Do i have to trickle charge the battery while towing?
asked by: Aj R
Expert Reply:
Hey Aj, you came to the right place. I can help with all of that. I will start with a list of parts I recommend for flat towing your F150, followed by a few important notes. Here is what I recommend:
- etrailer XHD Non-Binding Tow Bar - RV Mount - 2" Hitch - 10,500 lbs # e94ZR
- Roadmaster Smart Diode Kit for Variable Voltage LED Tail Lights - 7-Way to 6-Way Adapter Cord # RM38FR
- Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25
- Demco Stay-IN-Play Duo Flat Tow Brake System for RVs w/ Hydraulic Brakes - Proportional # SM99251
- Roadmaster Brake-Lite Relay Kit for Towed Vehicles # RM-88400
That will cover all the main components. You may end up needing a drop hitch like part # BLU28XR to compensate for any height differences between the base plate arms and the hitch on your RV. Any difference of more than 3" will require a drop hitch. Keep in mind the tow bar has 2" of rise or drop built into the shank.
I also suggest you get a cover # e76FV and a hitch lock # e98882 to protect your tow bar.
You do not need to disconnect the battery. A charge line is required.
The # RM38FR wiring kit I recommended is for vehicles with LED bulbs. If you have incandescent bulbs use part # RM26FR instead.
As far as wiring instructions, I have included a link to the manufacturer instructions for you on this page. Also, Roadmaster issued a technical service bulletin for the hybrid model (if that is what you have), and you can see that here:
https://www.roadmasterinc.com/content/pdf/85-6298.pdf
I have also included links to a few of our own videos that you should find helpful.
Is this your first time flat towing? Or have you done this before with a different vehicle? Replying on this page is the fastest way to get ahold of me. Let me know if you have any questions.
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Product Page this Question was Asked From
Blue Ox Base Plate Kit - Removable Arms
- Tow Bar Base Plate
- Removable Draw Bars
- Twist Lock Attachment
- Completely Hidden
- Blue Ox
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on Tow Bar Base Plate
Jesse M.
9/8/2025
Hey Aj, did you have a chance to check out the installation instructions for the wiring harness? I'm here to help if you have any more questions about setting up your F150 for flat towing.