We bring everything on every trip just in case. We leave the RV packed with everything all the time (excepting for food and certain clothing items) to minimize planning/preparation and the loading for each trip.
For instance:
1) We have cold weather window insulation with us even on summer trips.
2) We have fishing gear with us even when desert camping.
3) We have Internet access built into our RV so we can research the trip while on the trip.
It makes living so much easier and spontaneous the less there is to have to constantly plan for.
