We use Chevy/GMC cutaways with a supreme box. We use the 12 foot single axle cab and chassis design.
The leasing company we use delivers the truck wrapped, shelved, and completely upfitted the way we want it. This is a capitol lease with a $1.00 term buyout (no residual) . At the term end you can keep the truck or sell it and keep the proceeds. This frees up cash and keeps my fleet new. We turn trucks about every 5 years.
If you want more infor let me know.