Factory 60 series wheels will work just fine. Anything over 3.75 inches of backspacing will rub the steering knuckle/tie rod of a troopy....I'm running Mr. Brady's "old" Mohave Teflon wheels 16x8 with 4" of backspacing, and am using a 1.5" Spidertrax spacer on the front....
Gary...If you can get to Flagstaff, or know of someone heading up to Colorado, I've got a set of 5 60 series chrome wheels (15x7) that'll work great...you can have 'em. Shipping would be more than just going down and buying some steelies....
-H-