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Be careful. My 91 Chevy 3/4 ton conversion van was a unibody. I couldn't believe Chevy did that...
David
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The unibody for a Van is a good thing, it does have a frame but it's welded to the body.
I wouldn't worry about the van's strength, but that 10 bolt rear with that much load is a time bomb.
You could if you already have the van, upgrade the rear axle to a 14B FF, and the front to 8 lugs and you have areal 2500 or maybe a 3500 VAN.
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The good thing is that your wheel base is 126" which is good stability, just need more strength in the axle.
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