I just don't trust tires on a typical loaded RV even if they were installed yesterday. If one blows, I'd rather be going 60 than 80. I have also had a clueless ethnic driver stop dead on the freeway ahead of me, and was just barely able to stop in time. Glad nobody piled into my rig. On I-5 in Orange County, young idiots in "rice rockets" fly by at over 100mph, changing lanes with wild abandon. I don't try to keep up with 'em in a car or an RV and so far they have not hit me.
I am irritated by "pushy" local yokels on twisty mountain roads that can't understand that RV's don't handle curves at speed like cars. I pull off and let the parade pass when it is completely safe.
All those car ads that show stunt drivers doing wild maneuvers and imply that you can be cool too, if you buy their look-alikes....