That's getting in the spirit! Nice display.
Ok, since we all just love to spend other peoples money, here's a few more.(Apologies to LuckyDuck, I missed where he mentioned the EMS already).
A brass 90* water hose elbow.
Blue Camco water filters.
A 4' and 10' water hose for the times you're that close to the spigot.
A different colored hose for black tank flushing.
A black tank flushing wand.
A 45* clear sewer elbow, 10' and 20' sewer hoses, hose slinky, and sewer
donut.
A patio mat and folding chairs.
A cover for the power tongue jack.
A collapsible trash container for outside.
A couple of picnic table cloths and 6 metal clips.
Collapsible kitchen stuff (food storage, dish drainer, etc.)
Are you broke yet??
Golf umbrellas for each.
Some LynxLevelers (or similar), or 1x6x8 pieces of wood when the stab jacks
are too short.
A #2 square drive (Robertson) screwdriver, or multi-bit screwdriver with one
in it.
A basic tool box to keep in the truck.
I can probably come up with some more, just don't try to get everything at once. Christmas is coming! Try to keep everything as light as possible.