Things I have purchased and not regretted:

• Camco "lego-style" levelers for tongue jack and stabilizers
• Anderson style leveling block to level trailer
• Stick on levels (so I can see where we are at when backing onto the blocks)
• Wheel chocks from Harbor Freight
• 30/15amp adapter to plug into house
• 30/30amp adapter to plug into generator
• Water filter
• Water pressure regulator
• Basic tools for small repairs and tool bag to keep them in
• Extra fuses
• Breaker bar and sockets for lug nuts and water heater drain
• Kitchen supplies (pots and pans, utensils, dishes, cups, silverware, etc.) so we don't have to pack that shit every time
• EZUP for shade