I bought some disk brake caliper grease (apparently ok to use on seals/rubber) and ordered Marlin inner axle seals and decided to go whole-hog and tear down the front end and replace the seals, repack the birfields, and rebuild the brake calipers.
One of my rear adjuster screws is seized, but you're absolutely right about keeping the rear brakes tight. It also helps your booster and MC last longer when they aren't making such a long stroke (with ill-adjusted brakes) to stop the truck.
Steve H. - KE0KNH
Colo Springs, CO
'78 FJ40, '89 FJ62, '98 4Runner