When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
most service bodies do not use the bed holes. they use giant U bolts to clamp around the frame to the service body. Usually wood is between the body and the frame and the clamps squeeze it tight. same goes for flat decks.
Stuffz is right for mounting procedure. What your going to have to do is to measure your truck frames first. Some frames are 34" wide ie highboys and f350 duallies and most of the rest are 37" wide. In the future, more information on what kind of truck your working with so that we know what your dealing with.