In my toolbox:

Spare set of Keys for all vehicles, trailer, hangar, airport gate,
etc.
Small bandages -- I usually nick myself fixing most anything. Gotta
slow down.
Tire plug kit for the trailer tires.

For straightening bent parts of the car or trailer such as fenders
damaged by road debris or off-road excursions, a long "wrecking bar".
Also good for killing rattlesnakes if unarmed.

Hmmm. This trailer's tongue weight is getting a bit heavy!

Burt
Marfa Gliders, west Texas