I added a Furrion backup camera to my 2020 37FLH. The two which will work for certain are the Vision S5 system, part number FOS05TASF, or the Vision S7, part number FOS07TASF. I found the best price at Overton's (Campingworld company) with a 20% off coupon. The only difference between the two is the size of the backup display. I installed the S7 because my eyesight isn't great and worsening as I get older, but the system works great.
One problem you will likely have is the backup camera prep wiring by FR. Your 2021 model may have wiring that was already corrected and is plug-n-play ready. I had to clip the connectors from the S7 camera I bought and the wiring on the RV and reconnect with butt connectors. It was a good upgrade that I highly recommend, since its such a big rig.
The installation was a pain in the ass for me because the wiring on my RV didn't come with a lot of extra length to work with. And, because I was up on a ladder without a set of extra helping hands, had to resort to duct tape to hold the wiring from the RV to the exterior wall and a strip to hold the camera and wiring to the RV's exterior wall. Doing this kept the wiring from the RV from falling back into the wall and held the camera and wiring on the side of the RV to free up both hands and make the job easier.
Let me know if there's any other questions.
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