well....since you have a camper payment and can't swing building your truck properly as a tow vehicle, i think your best bet is to bring it back to stock and install a tranny cooler.
it's very difficult to build a multi purpose vehicle that will fit all your needs. sell those tires and start over. priorities and "wants" don't belong in the same sentence, let alone on the same truck. first thing i'd do is find out what gears you actually have...factory 3.08's or 3.42's suck to tow with anyway, on a stock platform.
if your trailer weighs 3,200 lbs. how much does all the other shyt you're gonna put in the trailer and load the blazer with? it adds up quick. i'm not sure, but i think 11,000 lbs is maxed out for the whole shootin match with a properly prepped towing package. fwiw, Bill