Thanks for the locations to pick up reasonable pellets on my way back from detroit this week. I have a 92 E350 extended van (huge formerly 15 passenger, now cargo) with the 7.3 diesel....I was a little hesitent to pick up 2 tons in it but have been reassured by my peeps at the diesel forum that it is within it's rated payload of 4400 pounds, doesn't look like I'm filling her up or eating much to stay within that but it should be worth it. If I could only get 3 tons in there.....

Think you are pushing the limits. Trailering with some brake help, maybe. Unless that has the 10,000lb axle, I wouldn't trust it. The sitting for years and the fact it was a "gov." vehicle you may be asking for trouble. Seriously think about renting a one way trailer for some, maybe even half. Make sure the brakes are tops and adjust your sweet spot to about 50-55mph. That load will be a trip to stop. I've got over half-million miles in/on my one-ton van (box). I wouldn't think about putting that much in it, and heading down the road. Your handling will be real different. Better safe than sorry.