Well equipped tool box, heavy duty tire inflator capable of filling your high pressure tires (at some point you will want an air compressor), multi-meter, assorted electric connectors/electric tape, duct tape. I am also a big fan of Command strips and their velcro strips for adding the finishing touches, which I started doing on shakedown.
Even if you don't know what to do, your neighbor at the campground (unless he is renting or on his first trip) will likely know how to help. We've helped folks with electrical, cable, and other issues many times. Somethings just can't wait for a return trip to the dealer.
My motto for repair stuff is if you bring it you will not need it...
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