May I ask your opinion....on tires..? I know that OEM (original equipment) tires changed from the Michelin XCA's to the Marathon ST's at some point, perhaps the late 80's or 90's? the XCA's are available again. I went with them, because they were OEM on my '77. I've also been told they have stiffer sidewalls?? Anyway, according to tire people, if I use the size they now put on Airstreams, mine would be lowered about an inch.. In your opinion, what are the pro's con's between those two tires.....

Dan