I was wondering how I can find out which wheel size I'm supposed to get when I change my wheels. I've been reading the posts on here and have seen that the factory wheels have a 135mm (offset??). Everything I have seen might show from 3.5 to a 5.5 on a 15X10 5 lug wheel. What size do I shoot for?

 

The factory hubs have a 5x135mm bolt pattern and the rims are HUB-centric. You'll want your aftermarket rims to be the same. Depending on what year your truck is, it'll have either 12mm (1997-early 2000) or 14mm (mid 2000-2002) lug-bolts. So, you'll need the correct ones of those too.