How much is a pop top install? Seems like this is priced within the market if a pop top can be installed for $10-15. Duramax vans are pretty rare so given a slight premium for that seems pretty reasonable.
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2015 Chevy Express 3500 Duramax
w/ Quigley 4x4 & Agile Fox shocks
Sold 2005 E350 Chateau
Quigley with Agile RIP, 6.0 PSD
$15k installed. But you have to drive it there and leave it for a few days. And the van is still 13 years old. Some of the more expensive diesels are much newer than that.