Aside from the thread that Crabman pointed you to, I keep a small set of tools in the TT for fixing things that might go wrong. This consists of a set of sockets, screwdrivers, pliers, crescent wrench, needle nose pliers, gorilla tape, zip ties, etc. It's just a good assortment of things to have handy so you can handle whatever might come along. I also have a torque wrench that I keep in one of the storage compartments for checking lug nuts periodically.
Mike, Sue, Sissy and Little Man
2015 Ford F350 Lariat FX4 6.7 CC DRW
2015 Eagle Premier 351RSTS