I would be checking tires, brakes and bearings. Check for structural defects (soft floors\ water damage). Then I would more on to the other systems plumbing, electrical, HVAC. Inspect hitch for cracks or fatigue. Then worry about caulking and seals. It an older unit that you may or may not know how it was maintained. So I would treated as if I had no idea how it was maintained. Then I could sleep well pulling 1000 miles from home to spend time relaxing not fixing.
2016 Ford F250 XLT 4X4 6.2L
2015 Rockwood Signature Ultralite 8329SS
Nights camping in 2016: 19 nights
Miles traveled in 2016: 2,575