It looks like you have a couple of issues that the dealer should be able to help you with. I.e. hitching up, lights and jack. The water heater is hard to understand. What kind do you have? If it's a Suburban, you should be able to access an on/off switch from the outside by dropping the panel and flipping a switch. Maybe another Wolf/Pup owner can provide some advise. If truly you have to crawl under the bed to reach the switch, I'd be asking the dealer to remount it to a more accessible location. Most campers are helpful in these matters. Ask around for some help.
2013 Surveyor SVF 293
2013 Ford SD F250 4x4 SC; 6.2 EFI V8
Reese 18K Elite w/slider - Ada, Michigan