im not the smartest guy when it comes to rim/tire combos, but putting 33" x 12.50" tires on a stock 15" x 7" rim seems iffy. if money is an issue for rims, just troll craigslist until you find a decent set that are wider than your stock rims for cheap if you really want to slap 33"s on. i wouldnt put 12.50" wide tires on any rim less than 8 inches at the least. also, you will have to get some sort of lift for your rig too. if you dont want to spend the cash on rims and a left, just go with 31" tires, they wont look as beefy but in terms of functionality, you are only losing maybe an inch of height compared to running 33"s. just my opinion, good luck and post picks with whatever you decide to do.