Picked up my trailer from the service shop/dealer this week. Pulled it directly to the storage lot so have not had a chance to try it out yet. They ended up replacing the temp switch in the water heater and found the power wire not connected on the furnace. Main problem - water leaking under the trailer, was fixed by replacing the water lines under the floor. Repair note says "found water line under floor runs over top of grey tank, removed grey tank to replace water line. They used a lot of 1/2" tubing so hope they got it. Going to take another nearby trip to test out before we make along haul.
Lesson learned - if you can fix it yourself and not impact your warranty, do it. It took a month to get it fixed and it's not like taking a drill back to Lowe's, it's a hassle and a 45 minute drive. I enjoy fixing things so looks like I will have something to do.