The basic UPS Truck used to be built by Grumman Olsen, but I don't know who is building them now but they are an application specific UPS Design. I know UPS also owns/uses CNG powered Sprinters and Transits in the City. I know that to be CNG fuelded in NYState, the conversion must be by either the OEM or an approved Conversion firm. (NY State has both Hybrid and CNG fleets for state use).

I have never seen a UPS truck in private hands and I used to do media work for them and asked if one was ever available for purchase (I could see it as a very useable location vehicle) and was flatly told "No Way". Like the LTV Jeeps and PO Trucks of the 80's, I believe that UPS self insures and assumes all liabilities for occupants and accidents. LTV Jeeps are a no go for private registry in NY State.

I remember the Grumman Olsen UPS Trucks to be Chevrolet powered but do not know who is the supplier now.

There is a company that makes a ADA compliant transit vehicle that is based on a Ford F-250 chassis, they also make specific vehicles for Medical Transport. As these are available to the public, as opposed to agencies, they were designed from the get go to be "DOT/50 state" compliant.

A friend was able to acquire a HMMV from the Army at Ft. Knox but was never able to get it cleared by KY DMV for highway use so he uses it as a service vehicle on his farm. He was told that the diesel engine could never be made compliant with regs and the lack of occupant safety systems and so forth made it a wash for road use. (This in a state where I have seen vehicles with no mufflers belching clouds of soot with the driver and passenger held in by rope in daily use!). No offense meant, CLK!