Thanks for the ideas and warnings.
I won't put a propane sticker on the side, I guess (though Sportsmobile already tagged one on the utility door on the driver side with the build). I might try building a plywood support for it... maybe a half-box sort of thing with a strap around the loading front. Or maybe just wrap it in foam as an impact limiter to minimize box damage.
Hopefully I will never be tempted to drive it in any place back east that might be a bother (anything much east of I-25, that is
). If they don't like my little tank, they sure won't like the bigger thing hanging underneath the van. Whatever... good to know to watch for restrictions, though.
I might end up back in TN some day, Scotty... spent a few years in Knoxville / Oak Ridge - one of the reasons I decided to pull the trigger on the Sporty: got sick of drying out tents in my living room from weekends in the Smokies!