Complete Flat Towing Setup for a 2021 Ford Ranger
Updated 01/19/2026 | Published 08/09/2024
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Question:
I want to flat tow a 2021 Ranger with my 2017 Thor Palazzo. I have a blue ox avail tow bar and a patriot 2 brake system. I know I need the BLU77XR base plate. Can you help with the wiring for lights and leaving battery connected?
asked by: Lisa
Expert Reply:
Lisa, you don't need anything else to connect your Blue Ox Avail # BX7420 to your Blue Ox Base Plate Kit # BLU77X they will connect as is.
As far as the rest of the setup goes, you already have the Blue Ox Patriot # BLU37TR so all you need is the 12 Volt Outlet Kit, 20 amps # RM-9332 if you don't already have it, the Roadmaster Brake-Lite Relay Kit for Towed Vehicles # RM-88400 and the wiring harness # RM-15267.
You did also mention adding a charge line kit, it's actually not needed since your battery does not get drained while flat towing.
Product Page this Question was Asked From
Roadmaster Brake-Lite Relay Kit for Towed Vehicles
- Flat Tow Brake System
- Brake Light Relay
- Roadmaster
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on Flat Tow Brake System
Lazer S.
1/19/2026
Hey Lisa, how did your flat tow setup for the Ranger work out with the wiring harness and brake relay kit? Knowing how the lights and battery connection performed could really help others setting up a similar system.