@Timothy702
If you provided the dimensions of the Sprinter Van to the Host and they said it would fit the parking spot, then I agree with @Helen3 that Airbnb might work with you on canceling the stay with a refund.
That said, many properties will not accomodate your sprinter van; especially in large cities. We mention in our listing that we can only accomodate passenger vehicles in our driveways; not oversized vehicles, RV's, trailers, or boats. Free street parking is available. However, some areas restrict parking oversized vehicles and RVs on the street.