Hi Walt,
If vans are a particularly tight market in Utah, which totally makes sense, have you thought about looking outside your local area? We just flew one way to another state's urban area to get a used pick up truck, which is in very high demand in my local area, and my research makes me confident that it saved us $5-8K. Then we drove it home. We had a list of 5 specific trucks to look at where we were flying, so the odds that none of them would work out seemed pretty low to me. We ended up buying the second one we looked at. Also, the dealerships were fine with doing out of state taxes, registration, and plates.
Flights are often cheap right now, as are hotel rooms. Rental cars seemed normally priced. Even the most pessimistic view of our travel costs (which puts dollar values on my frequent flyer points) put the trip in at under $800, and it was under $500 if you don't value the points, so it seemed worth it to have a much larger selection of exactly the vehicle we were looking for. Plus, the trip itself was really fun . . . best pizza we've ever had, and my son and I had a nice time talking and listening to music on the way home!
Basically we looked on Autotrader and carvana and made the location radius really big (500 miles). We didn't go into it planning to travel; in fact we thought we would get something from the dealership closest to us. But, once we figured out where what we wanted was the cheapest by A LOT, we made that the central zip code and search that local area.
Good luck in your quest!