I won't worry about going 7o mph with the 20" wheels! In april I purchased Joy & Tony's 45 2 ton in Ontario, NY and drove it home to Nepean, Ontario, Canada with tires that were probably 25 years old, and hit speeds of 70mph. Since then I purchased new tires and carefully took apart the rims, sandblasted them and then dp40 primed them and painted with a good quality epoxy paint. I put everything back together and now I use the truck everyday to drive 25 miles to work at an average speed of 60mph. No problems yet.
