I got a 2008 Chevy Express with a 12ft box, inside it's actually 150inches of cargo space. 9.5 ft tall, and it's as wide as the van itself, the problem with getting anything bigger is they start making them wider than the van and that's when you start losing alot on the mpg. I average 15mpg with a 4.8L it's dry weight is 6700lbs with me and full tank. I weigh 220lbs, so the van itself is about 6500lbs. I can haul 2900lbs. So if ur looking for a cube van, stay in the 12ft area, anything bigger and u will lose alot in ability to haul weight And mpg's. My box is made by supreme, but it seems they make most of the boxes I see out there. The 12 ft penske boxes, are not actually 12 ft, so if you're looking into those beware if u want to haul 3 skids. my brother in law bought one, and it's only 135 inches inside. Hope this helps alittle. My first post here by the way, been reading alot, but finally seen a post to respond to.