Setting up for towing

[crawdad]

I am wanting to set up the '86 LWB I recently acquired for towing. The RPO sheet wasn't on the truck, so I'm not sure what the gears are in the rearend. It has the original 305 CID engine, 700R4 tranny. GVWR for the truck is a little over 6000 lbs. if I remember correctly. I would like to get your ideas on modifications, if any, I might consider making in order to make it a reliable tower. Most of the time I'll be using it to tow my car trailer (hopefully with more 73-87 trucks on it , and every once in a while I'll be pulling the travel trailer down to the coast. It weights around 6-7000 lbs. I am fully aware that I shouldn't over gross the truck, so without getting into all of the warnings about over grossing the vehicle, what would you recommend doing to the truck. Thanks.