Brad,that sounds cool,it is great to know that other guys are in the middle of similar projects.
When I first figured out a while back that 19.5 wheels would not be a problem for the direction I wanted to go,I thought I had it licked.But all the trucks and step vans I saw in my travels all had what looked like "low profile" type tires.I figured when it came down to it,I would be able to locate taller tires for a 19.5 wheel.Now that I am serious about,and trying to button down the plan and locate everything,it seems that they are not out there.Its just a shame,would have been simple cheap and easy.
But,I can tell that Grigg has been waging war on this problem for quite some time and is ready to unleash a hornets nest of knowledge about it.