Intro from an old Assembly Plant guy

[D13]

My 1990 was 4.3 auto 3.08's, towed many vehicles on open trailers, just don't be in a hurry (run 45-55mph) and NEVER tow a 700R4 in OD. Once overloaded my 7000# trailer badly enough the the wheels flexed and popped off the hubcaps. Fixed that with 'burb wheels and HD tires, but truck did fine. Did have some issues stopping since trailer weighed 2X the truck...
Enclosed trailers have a lot of aero frontage.
One of the big keys is think of how you will use your truck the most, set it up for that, and accpet the compromises. Mine are DD, set up for fuel economy, and accpet that towing will require some attention. i highly recommend a posi of some flavor, the worst towin experiences are when I can't move the trailer because the greass is wet or the ground a little soft....