The rack is an ATOC draftmaster. We've had car-top ATOC racks for years, so this was a natural choice for us. The draftmaster isn't cheap. but it works well for us, since we can put either our upright or our recumbent tandem on it, and it is easily done single-handed. The rack drops down to mount the tandem, then swings up.
The bikes do get a bit dusty when we drive a couple hundred miles, but I suspect that half of that comes from just sitting around in dry countryside. They stay out of the wind (no bugs) and up off the road (no spray that we've noticed so far).
To mount it on the Vegas, I had a bit of a conversation with ATOC - they have an extended hitch mount that was needed so that the rack stays off of the RV. It has about 5 inches of clearance, which seems pretty good to me.