In the trunk: Wheel tubs, a fuel cell, 2 roll bar struts with a horizontal tie bar, and a california duster, lol.....not room for much else.....
In the trailer and on the truck, I carry all of what everyone has posted and then some, including spare wheel bearings, grease and seals for the trailer, 2 40 ton bottle jacks, floor jack and a full size spare for the trailer, big generator and air compressor with air tools. I go prepared as it sounds like most of us do.
Good thread and great suggestions !! Too many times people hit the road unprepared. You can never have enough tools or supplies.
AAA is a good and cheap option- my sons show truck had an ignition issue and they towed him home- 200 miles for $150.00 plus the $100 tip we gave the roll back driver. It was 2am in the morn, it was well worth having. It would have prob cost $5-$600.00 if he didnt have it.
Harbor freight has some decent tool kits. Wouldnt wrench with them everyday, but for under $50.00 you can get a decent kit.