I'd suggest that you leave it alone. 1.5" is a pretty good spot to be in for ride and performance on these trucks. Raising it another inch won't make any difference in tire clearance in the areas where you're likely to hit with 305s (a fat 34) or 315s (a fat 35). You'll definitely have to address the rear of the front fender well, KDSS Bar rub on the drivers side, and potentially fender clearance at the top of the wheel well depending on the offset of your rims. The front fenders on these trucks is not set up great for big wide tires. Check a few of @TeCKis300 's threads in his signature above, he's done the wide tires as well as anyone, albeit on a LX. You'll likely need to do everything he shows, AND deal with the KDSS Rub. An extra inch of suspension height is the least of your worries, particularly if you go as far as 315s.
Also, 4WP is the Walmart of offroad shops. I wouldn't have them do anything more difficult than mounting tires and wheels IMO, and that's based on experience with multiple different locations of myself and others I know. The 200 isn't that complicated, but there are nuances to doing it right that is more challenging than slapping an angry grill and some 35s on 24s on a wrangler.