My tool box for the camper consist mainly of the normal tools that you need to work on the camper such as a couple of Robertson screw drivers and so forth. I also have electrical tools for wiring needs and a Fluke Multi-meter for the pedestal. I also have the collection of sealants and roof mending tape that is needed for repairs.
I then have my truck tool box which includes a clicker type torque wrench. Another item I am now carrying since the tire pressure on the camper is 110 PSI is an electric air compressor rated for 150 PSI and thirty feet of air hose and chuck. This is stored in the truck's boonie box.
You may want to carry a spare fuel filter if the unit has a diesel engine. I carry two, in the boonie box.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67