Invisibrake and 2016 Chevy Colorado

I'm new to dinghy towing! Just had a roadmaster and an invisibrake installed on my RV and 2016 Chevy Colorado. After taking 5 days to install, Camping World finally considered the install complete. The 2016 Colorado manual states the battery must be disconnected during dinghy tow, but the Invisibrake works off the battery, I am told. We disconnected the battery but installed a separate line from the battery to operate the dingy tow. We towed the vehicle approx 30 miles to home and upon arrival found that all of the accessory lights and dash monitor where in the on and lit mode. The dash screen was VERY hot to the touch.
Will be taking the RV / Toad back to Camping World for resolution but am curious if anyone else has encountered this problem and how did you resolve.
Thanks!