Montana RV rentals?

Flying in for a wedding north of Missoula in late July, so can't drive out. Going to Yellowstone for a week after and considering a RV rental rather than a car/hotel. 5th trip to the park in 10 years, so I'm good on what to do and where to stay.

I loath the idea of Cruise America. Have googled/contacted a few, but wanted to check here if folks have information on places they've rented RVs in Montana, perhaps I've missed some.

Cities, in order of preference
Bozeman
Missoula
Billings

Long shot considering most folks here have their own. :-)

Thanks!