You should have the owner get the GVWR de-rated from 12,500 pounds to 10,000 pounds. This can be done by an upfitter or the manufacturer of the body. Even when empty, you are required to log in your van since its GVWR is over 10,000.Door sticker reveals a 12500 limit, but would have to log for that weight, and dual wheels has not been an issue, as yet.