Personally I can't even fathom driving an 80 with a trailer around the mountains here. Let alone loaded with a bunch of people, camping gear, and bumpers/armor/winch/etc. How much does mileage suffer due to the inherent nature of the supercharger (and not the lead foot)? My buddies similarly setup 100 series (33's, bumper, etc) goes much faster and gets better mileage than my NA 80.
You could also go early model 100 series for not quite as much money. FWIW, I think a 100 series would be the way to go for a DD and towing things.
'97 lx450, 170k, factory lockers, ome 850/863, 285's, 4 working doors(1 more than the old fj55 )
'74 project pig (sold