Mike E
https://www.arizonamotorcycleadventures.com
We dealt with them when we rode the AZBDR in November. They have another location in Colorado. They’re a bit unique since they allow use of the bikes off-pavement when most places do not.
https://www.motoquest.com is another option.
Has a location in LA and SFO. They don’t allow use off-pavement unless you’re on a tour with them.