You can put a 285/75/16 on your rodeo.. Tight fit BUT A sawsall fixes all. LOL only kidding. you will get rubbing and you will gain a little more ground clearance. Depending on what Manufacture you get your next set from some of them are (P)4 ply, (C)6 ply,(D) 8 ply. I have yet to see a (E) 10 ply yet. Also when you go bigger in tire you dont have to run a lot of Air Pressure, Since you have more volume of air. I have 31x10.50x15's on my Trooper and I run 26 psi but im also Running on the stock 15x6 and they pinch the tire BAD, Good Idea to go with a wider wheel when going bigger for wear and off road stabilty. Off-Road I run 15 PSI and havent roll off a bead yet.. Knock on Wood... I Also Think that the Older Isuzu's you can run Up to a 32 inch with no lift but torsions have to be turned up. Keep in mind also that your fuel mileage my be affected and your RPM's may not turn as fast as you like, I have seen that A LOT. People put lifts on and they dont have the gearing for the BIG tires and they lose a lot power.