For my 2014 Enclave I initially bought the fuse switches from Amazon. But I discovered that RVI braking had a battery charger. It takes a line from the coach battery to the toad, but works great. I sent back the switch to Amazon.
Crespro 2021 Grand Design 310GK-R, 2020 F250LB, 7.3L, 4.30, Reese 27K