Wait: I'm not saying they can't tow! I'm saying that once you build one into an entire 35ft+ motorhome, THEN you don't have as much leftover towing capacity as if you'd started with a class8
.
In my case, I've got about a 28ft motorhome body (not including cabover bed) on a Ford F450 Super Duty...and I'm balls to the wall on weight
. I could tow a 10ft rowboat maybe...a VW bug would be...possible, but not really smart
.
But I *can* carry my Buell in my 10ft garage so I'm happy
.