Buy the equipment your first campsite and rig require: safe parking and leveling supplies, correct electrical connection equipment, potable-water gear, and a separate sanitation kit. Check what your RV or rental already includes. Add convenience items after a shakedown trip.
First, cover the campground connections
Match every connection to the RV manual and the campsite. Rental owners may already supply these items; ask for an inventory.
Then cover an ordinary day at camp
Pack a small menu, weather-appropriate layers, bedding that fits, towels, personal supplies, and only the cookware you need. Keep commonly used items reachable.
Let the first trip write the second shopping list
Keep a note of what was missing, awkward, or unused. The best upgrade solves a problem you actually had. You do not need a fully outfitted garage to enjoy a first weekend.
YOUR NEXT USEFUL STEP