I'd have a PPI of the trailer before doing the deal....and if the systems are all functional AND you've had someone make sure you don't have any leaks (or water damage), I'd pass on the extended warranty. Chances are that most of the new trailer fixups have already been done, and if it's tight and dry, I would pass. Even at $100 an hour for having work done, you'd need a big mess to hit 25 hours. True, most of the "systems" -- i.e., fridge, stove, furnace are now out of manufacturer's warranty, you could still replace just about anything with that amount.
"SilverLeaf II" 2015 30' Classic
2014 RAM 2500 Laramie 4x4 CC w/6.7L Cummins
WBCCI # 3430-Unit 21