Stay on top of routine maintenance
Honestly, treat the RV as good as-if not better than-you did when first bought. Stay up on oil changes, tire rotation/replacement, and continue to provide monthly checks on fluids under the hood, monthly checks on window and door seals, and address any problems when they first arise. Putting the extra time and effort in often will work toward the value being maximized when it is time to sell.
Protect the Exterior
Just as important as keeping the interior clean and neat, the exterior shouldn’t be neglected. It needs some TLC as well. When parked at home, keep the RV protected from the year-round elements with either an RV cover or under an RV carport. A third option is to store your RV in a rented storage unit (most common during winter). Using a sealant spray to protect the exterior is both efficient and quicker than applying wax. Spray and buff, and that’s that. Specifically, pay attention to the crevasses, as these areas attract dirt and dust that can cause damage to window seals and other rubber seals. Covering the tires is also suggested as a way to extend the life of your wheels.