Spray the tailgate hinges and cables with some lube. I used a fluid one like Slick50 One Lube, then hit it with some spray white lithium grease.
Make sure the spare tire is cranked all the way up, until the winch begins to ratchet.
Make sure the rear seat floor bolts are tight. Mine was slightly loose, and would squeak and pop when the body flexed. You can bounce up and down on the rear seat to test.
Grease your swaybars. If you have the tools and time while you're greasing it, add the grease fittings. If you'd prefer, I think ToddZ makes and sells them, and they're well worth whatever he charges.
You'll need a drill, and a tap and die set. I bought a set of fittings with 1/4-28 threads, and needed a 7/32 drill bit for the hole. It's real easy to do, just takes a little patience. Either get a new set of brackets, or take them off the evening before to be re-installed the following morning. You need to make sure that the bushings have grease channels with a main channel running all the way around the center of the bushing.
To do so, take off the brackets, and clean them very well / remove any rust. I painted mine with some rust fix after sanding, which turns into a black primer. Drill the holes dead center with a 7/32 bit, then install the bushings in them. I went as far as compressing the bushings into the bracket by using c-clamps on either end of the bracket, where the screws would go, to ensure the holes line up. That part is crucial, otherwise the grease won't go where it needs to, and just squirt out the wrong place. I drilled a clean hole in the bushing through the hole in the bracket, to ensure that they lined up. Again, this is critical, and the hole must go through a grease channel in the bushing. Remove the bushing and use the 1/4-28 tap to cut the threads in the bracket hole. Clean the hole and sand off any sharp edges, test the threads with the grease fitting. If the threads work right, put some loctite on the fitting threads and screw them in. Give it time for the loctite to dry, and re-install.
I used straight fittings for the fronts, and right angle fittings for the rears, with the right angles pointing toward the center of Trac for easy access. Now when I'm down there, it's 3 quick pumps in each fitting with a grease gun, and some Slick50 One-Grease. I pump some in between each spring leaf as well.
You might want to consider an energy suspension Sway Bar rebuild kit for the front sway bar. It comes with 2 bushings that have channels, and two 5-3/8" end links. If you have the EE rear bar, you're all set.