Well, despite what the local wrecker told me, I went to check out their inventory and found the hubs I needed in an 88 3/4 ton van. I pulled them in a few minutes, and they were in great condition, as were the bearings and seals. I could have taken the whole rear-end for $98 bucks, but I didn't have the time. They charged me $60 bucks for the pair of hubs and I'm a happy camper.
I found the same rear end in another truck there, so if things look bad when I get into the pumpkin I might go back and grab it.