it could actually be the axleshaft seals leaking, greas eon shoes wil make linings grab the drums and lock em up when truck is unloaded, leaking seals is very common problem on the eaton 3/4 and 1 ton axles in 67-72
sqealing pads is caused by two things, either the pads are metallica composition and youl have to live with it unless you replace them, or they pads are loose in the calipers and need anti sqeal applied to the backsides of them, you can get the stuff at auto parts store
good luck
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