This might be hard to hear, but I bet they will total it.
They will look and say frame damage.
But that is in fact kinda good news...
You gather all the receipts for the original purchase, and the conversion....
You haggle for a bit and when YOU are happy, you ask to have the settlement check and keep the van. They will give you like 80% of the value, and you keep the van.
Happened to my son's '92 Cherokee, when he was T boned. he damage was a dent in the rocker, and a bent rear wheel, and rear axle. Replaced the wheel/tire and rear axle, for $200 from the junkyard, left the dent, and he put $2500 in his pocket for future mods!
Only down side he had was its now a salvage title... but he does not care!
Get your cash, keep the van and fix it as good as it needs to be for safe driving...
Put the rest of the cash into making it better!