Beware of those suggested labor prices. I have a 2016 Leprechaun 319DS, and just spent a couple hours crawling under the motorhome, installing a brake indicator light for my Blue Ox tow bar system.
The tank bottoms were exposed, and the pads attached directly to the bottom, with the wires running up and feeding into wire looms. I realize that there are switches involved, and the need to locate the master switch, but overall, the system looks to be very straightforward. I don't know how your unit looks for the bottom side, but on mine, running the loom and wire and avoiding the V10 exhaust system, as well as the exhaust pipe from the generator, wasn't an issue.
2016 Coachman Leprechaun, 319DS, Motorhome, Dodge Durango Toad