Last fall we went with Desolation Outfitters
in Roosevelt. They picked up our car at Sand Wash and drove it to Swasey's, clean, good shape, and on time. He was less $$ than other outfits and we dropped off a key with him on the way in (we arrived from the north).
I've also driven our shuttles and flown back with Redtail a few times. The drive's neat, in the daylight. Not so cool at night. The flight is wonderful (with a mildly gripping landing at Sand Wash).