Glad mbopp mentioned the roof. I check and clean mine (along with the awning)before the first trip in the spring and again in the fall after that last trip.
Tire pressure before every trip and again before the ride home. Replace when starting to see checking, small cracks. Generally 5 years, sometimes sooner if not taken care of or sitting in the sun too much.
Bearings repacked every two, greased with gun in between like mbopp, replaced as needed along with seals.
Brakes checked every other year unless the previous year looked like they may be getting close.
Camper water system gets a good double sanitation treatment each spring, a new water filter, frig vents, water heater vents, roof frig vent, all get checked for obstructions and a little shot of compressed air.
Plumbing fittings inside get checked for leaks, tightened as needed.
Propane connections get soap bubble tested to see if anything needs rewrapped with tape.
Touch up paint on frame or other painted area's after sanding anything looking like it has a little rust starting.
2015 GMC 2500 Denali Crewcab 4x4
2019 Forest River Wolfpack 23pack15
Hope your travels are safe and the friendships made camping are lasting.