Since my MH is "seasoned" (1988) and I always also have either jet skis or ATVs with me, I carry a full (about 8" x 8" x 24") toolbox, with standard and metric wrenches and sockets, screwdrivers, crescent wrench, pliers, electrical tools (stripper, crimper, multimeter, etc), snap ring pliers, etc.
Always have a hammer (& stakes) in another compartment, along with some extra fluids (brake, steering, oil), belts & hoses (and road flares). Have always had a jack & lug wrench, tire pressure gauge & temp gun.
Never considered a torque wrench; it's pretty big/cumbersome, and I can estimate close enough to get home. No caulking gun, either (also big/cumbersome), although I do have a small tube of silicone in the toolbox. Of course duct tape, electrical tape, and WD40 is always a no-brainer.