Alright so factory 2wd trucks came with 215/85/16 tires, and factory 4wd dually trucks (which only came in cab & chassis models) came with 235/85/16 tires. Yes there are trucks that are not cab & chassis but still 4wd dually, they were modified AFTER they left the factory so they don't count for this discussion. Lots of guys like running 235/85/16 tires on their 2wd dually trucks, it just looks better. Problem is... The wheels just aren't spaced properly for the wider tires. Sure, you can get away with it most of the time, but it cost me THREE TIRES AND A FENDER so I wanted to give a little more light to the subject! This picture is factory 2wd wheels, with 235/85/16 tires my fat hands can't pass between the tires, there's around 5/8-3/4 of an inch between the tires: This is factory 4x4 wheels with 235/85/16 tires on the same truck. There's probably about 1-1/2 inches between them: MUCH better. Now the tires can't rub when loaded and heat up and cause multiple blowouts on the highway! Thanks for reading!