To me riding with sag vehicles is no fun. Half of the fun comes from the feeling of freedom and self-sufficiency: something that cannot really be had with a supporting vehicle.
I don't envision myself ever touring with a carload full of stuff. If I need it, I haul it.
(I also wouldn't ever drive to ride... But then, fly to ride, as in "a tour of Europe" - well, that's a different matter.
)