I did a search and could not find the info so I crawled under the truck and found 16x7 jj 30 which translates to 16" Diameter / 7" Wide /wheel contour / +30mm offset. on aftermarket wheels before the offset it reads ET +30 . The lug pattern is 6 on 4.5" it is very important to stay as close as possable to the factory offset or tires can rub and wheel bearings will fail. Here are some helpful links.
http://www.rsracing.com/tech-wheel.html http://www.4crawler.com/Diesel/Tires.shtml
