Braking and Electrical Parts Needed to Flat Tow a 2021 Chevrolet Colorado Gas or Diesel
Updated 01/08/2026 | Published 01/07/2026
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Question:
I have a 2021 Chevrolet Colorado 4X4 that I want to flat tow behind a 2017 Thor Chateau E450 Super Duty using a Demco towbar setup. What is the recommended braking system for this setup? Thr RV has hydraulic brakes.
asked by: Glen L
Expert Reply:
Hey, Glen!
The best brake system for your 2021 Chevrolet Colorado is going to be the Demco Stay-IN-Play Duo Braking System part # DM86VR. Once installed it will make flat towing easy especially with the wireless monitor you will have with you in the front of the RV.
I did go ahead and check into all the other electrical parts you will need to flat tow. If you have a gas model you will need the Roadmaster Battery Ace battery disconnect part # RM39ZT. However, if you have a diesel model you will need to get a different battery disconnect, you will need part # RM93MR. You will also need one for each battery so if you have 2 batteries, you will need to get two of part # RM93MR. Lastly, you will want to get diode kit part # RM-15267 for all the taillight functions.
Is this your first flat tow set up or have you flat towed in the past with your Thor Chateau?
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Demco Tabless Base Plate Kit - Removable Arms
- Tow Bar Base Plate
- Removable Draw Bars
- Twist Lock Attachment
- Completely Hidden
- Demco
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on Tow Bar Base Plate
Glen L.
1/7/2026
We have been installing some items to prepare. We installed a battery disconnect switch and a CURT wiring harness with diodes. We have a Demco towbar and ordered the base plates yesterday from eTrailer. I'll go ahead and order the Demco system soon. Thanks for the quick reply.