I solved seatbelts by putting Silverado bucket seats with integral shoulder harnesses in the front. For the rear I didn't want to go to the pillars so I bent a roll cage and put the shoulder points there.
North Rim sounds awesome!
Do not make this a TLCA event. Grown ups can camp peaceably together. Look at all the years of Surf n Turf. No TLCA needed, just cruiser owners having fun.
If you can't do a factory setup, I solved that in my pig by using silverado bucket seats with integral shoulder harnesses and bending a roll bar for the back where I attached the shoulder points for the back belts.
Making it a TLCA event would suck. Usually way too uptight. Why can't it be guys camping with their rigs?
I vote colorado or california or somewhere in between.