Thats crazy, I would pay them nothing, did removing the plate solve the problem?
I'm kicking around installing the 2nd a/c in my ft. bedroom, did they install the factory unit that would of come with your camper had you ordered the 2nd a/c or a aftermarket unit? Did they install a new thermostat or do you control new a/c from unit itself?
2015 345 BHTS 5th Wheel
2005 Chevy 2500HD Duramax Diesel