We have a 2013 Sunseeker 2860DS, today we noticed the water heater on the driver side of the vehicle looks like it's starting to wiggle out of the vehicle.
There are about six to twelve screws that hold the unit in the camper. My guess is they didn't put enough in or they didn't get a good bite or broke.
U can look on u tube and see some installs and removals to give u an idea. Think take the outside trim off and reseal and put in new screws that get a good hold.
Almost pulled mine while working on the propane. Didn't want to have to mess with caulking and sealing. I will be moving this weekend or first of next week. Good luck.