Fuses, extra glad hand seals, crow bar, hammer, needle nose pliars, wiper blades, spare headlamp, something to cut seals off your trailer.
All of the above can save you time. Learn to do the simple stuff like replace glad hand seals, headlamp, wiper blades. Crow bar is if your fifth wheel gets stuck. If you over shoot your fifth wheel you can use a soda can to tilt it the other way. Hammer for stubborn trailer door handles, locking pins that get stuck, etc. Fuses for if you blow a fuse, obviously. Needle nose pliars so you can grip the tiny fuses better.
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