Factory steel wheels are a bit narrow for a 33x12.5" tire, but on the other side, 15x10 is a bit wide. 15x8 would be a better choice, usually.
Quadratec, 4wd and Summit all carry plain steel wheels, fairly cheap, too. Most come in black, but paint them gray or olive drab and you've got that military look. Jeep Steel Wheels - Quadratec
And you're close enough to Quadratec that you could buy in person, then open one up next to your Jeep and if you don't like them... walk back inside and return them. Call to place the order if you want to buy in person, they don't usually stock wheels at the West Chester warehouse.