For whatever it is worth. You use to be able to change it with a certification from the dealer wear purchased and a inspection from DOT in your state. This was outlawed as of last year. Alot of tri-axle dumps were doing this in Florida. Buy a single axle dump and add additional axles later. PN has been cracking down alot on this lately. Article in Landline I think? I would keep it at 26,000. Most companies would still put you on. We have a 33,000 truck and haven't hauled loads over 5,000. Not sure going to 33,000 would matter that much.