I've done this drive many times through Yakima and then across the Columbia at Umatilla. There's interstate the whole way. Maybe they don't want to go over the Blue Mountains?
No kidding. There's a 4x4 C4500 that's been bid up to $35,000 right now on ebay. Those are cool c4500's you have for sale, just a little too big for what I'm looking for.
Pretty cool C4500 4x4 ambulance on ebay right now. The buy it now price is high but only 16,000 miles.
https://www.ebay.com/itm/2008-Chevrolet-4500-AMBULANCE-4X4/183225664538