The comment regarding tire quality reminds that as a young pup I worked for a while in a busy Goodyear tire shop. Some may remember that in the 60's the OE tires were 2 ply and the 4 ply were optional-and quality of many tires was iffy. Tires with defects and being out-of -round (and wheels) were every day. It wasn't rare on a road trip to have flats, cord separations or road hazard events. Spare tire use was always part of the picture. (as bent 'decorative' Riv bumpers from the OE jack can attest!)Tires are much better today, but there are still many, IMO, that are not round enough. We used a spinning 'hop' of more than 0.030" as a guide and trued many tires over this amount. Today, about nobody but racers know about this and the term is now 'shaved'. 'Road force' balancing 'manages' sins today. As always, monitor tire condition and pressure. (and bring along a small floor jack!) Rivs, do love the open road. Dan Mpls. Mn.