In 2018, we trekked route 66 in our '77 Ramcharger. We took the "old route/original" 66 as much as possible. Single highways, in no-mans land. We passed through 9 states on that trip, coming back up through Dodge City, KS. In 2019 it took us up through the U.P. of Michigan, all the way to Drummond Island. Our '77 Van we just bought a few months back has already been in 5 states. Reliability is HUGE on my list.
