The owner'smanual is no help at all, and I have been un able to get my hands on a 1987 RV and Towing guide from Ford, so here goes:

1987 F150 4x4, long bed, Supercab. 5.0 EFI engine, AOD trans, 3.55 RA, Factory super cooling, transmission cooler and tow package.

What's the maximum weight this thing can tow?
Owner's manual shows 3 different GCWR's for this combination, with no explanation at all of which one applies. Door post sticker doesn;t show any GCWR at all.

Thanks in advance.