It might be interesting to look at the FSM weights. I assume they are empty weights (no fluids)
89 swb 4banger m/t - 3207lbs
89 swb v6 various - 3494-3538lbs
89 lwb various - 3924-3979lbs
86 p/u - (It'll have to wait until I'm out in the truck - 1t's about 20*F here and I'm not going out there again tonight, and the stinkin' Haynes probably won't have it, and I can't find my 85 p/u FSM...)

Not responsible for advice not taken...