The rules look to be “unique , rarely seen”
A few here. Some with photos. Some simply described.
My T1n ten passenger sprinter had about 70k on the clock when we got it. About 8 hours interstate going home on a very windy day induced buyer’s remorse, to put it mildly. Koni adjustables all round, monster rear aftermarket rear axle roll bar, aftermarket front strut camber shims, Timbren elastomer rear axle bits. Seriously considered for sick grins going to a local autocross event.
The vortex generators are good for about 5% mpg. And They make a vast improvement in cross wind and fast passing big truck buffeting. Over 100k mi they have been on and off. Zero doubt. Google Air Tab for excellent info. Canadian outfit selling mostly to otr freight companies. Base level research done
by NACA in 1930s. I actually did my own because I do shit like that. You WILL hear “snake oil” from the cocktail party congenital intuitive aero engineers. Coast down testing. Log books.
Build out requirements. Must be able to function as steel tent. Must be able to go back to ten passenger airport shuttle, tour bus when the young folks arrive from UK and or NZ.
All furniture is J bolted to seat mounts. With a helper and two hours a complete change out is possible.
Pillion bed across in back rests on window sills. Set up 4 minutes.
The ARB refer/freezer is brilliant.