Here is my normal pre-trip checklist:
Jack front of vehicle, check wheel bearings and trunnion bearings for looseness with the 12/6 method.
Check steering system for looseness with 9/3 method.
Remove front wheels.
Inspect front pads
Torque caliper bolts.
Inspect brake hoses.
Torque knuckle trunnion bolts/nuts.
Check birf grease.
Re-install front wheels and torque lug nuts.
Jack rear of vehicle.
Check for wheel play and remove rear wheels.
Inspect rear pads.
Inspect brake hoses.
Torque caliper bolts.
Check/Adjust parking brake.
Re-install rear wheels and torque lug-nuts.
Check differential and t-case levels.
Grease u-joints. and steering components.
Check tire pressures including spare.
Torque front bumper mount bolts.
Torque winch mounting bolts.
Check winch oil.
Check winch operation.
Inspect wire rope.
Torque receiver hitch mounting bolts. (if towing)
Install hitch and torque ball nut. (if towing)
Check under hood fluid levels.
Check belts.
Check air filter.
Check lights.
I also make sure all my PM is current. Personally, I perform all of the following annually before trip season:
Cooling system service.
Transmission fluid drain and fill.
Transfer case drain and fill.
Differentials drain and fill.
Flush brake fluid.
Repack front wheel bearings.
Replace fuel filter, plugs, belts.
Inspect spark plug wires.
Inspect cap and rotor.
Dave