It appears to be for Richardson's RV Center in Riverside, which appears to be quite legit -- the address is an RV dealership if you look at Google Maps.
They appear to have four locations...
As always, I would want to make sure I was dealing with them and not some scammer trying to graft on top of them... but with lots of RV's on location and multiple reviews on Yelp (some good, so bad...a normal'ish mix)... I would think Richardson's is legit.
The Green Machine -- 2000 Mountain High Coachworks Summit (Spartan chassis / Cummins ISC)
...and F-Troop: Fearghus, Fiona, and Frankie (Cairn Terriers)