ok so wait, your truck already has bags? or are you planning to put bags on it? and DONT use a compressor that runs off the belts, it'll rob you of horsepower and they're never built very well anyway. buy an airmanagement kit from
www.suicidedoors.com they're probably the best referred to site for air suspension.
also, why are you running 2/0 through the cab? is your batt in the bed?? cause 2/0 seems huge for amp duty!
and for running the wires, rangers (and most other american rigs) use C frames, and generally thats a great place to run your power wires. thats where I ran mine (i have a 93 ranger). just clean the **** outta the frame rails, and use zipties as often as possible to secure the wires.
like i said earlier, get an electrical pump, not a mechanical one. also, if you're running
TWO 9.1's AND bags, you definitely need a highamp alternator, hell i'd probably even look into a 2nd batt with isolator.
as for painting, if a family member already has a body shop, let them do all the prep. they'll have the proper tools to make it look good. if you're hell bent and loco enough to do it yourself, start with a lower grit and work your way up, just like sanding anything else. but that seems like a HUGE undertaking for a 91 unless its going to be a perfect showcar, but if you're wanting to get all the paint off, have it sandblasted. if it were me... i'd just repair what body work needs to be done (including sanding and bondo) and respray it over.
i know a ****load about rangers, so if you have anymore questions, lemme know
edit: if you runt he power wires through the framerails, be SURE to use at least one layer of tubing taped very often.