WOW, I tried doing a search for RV detailing (Mobile or otherwise) and all I could find was "MobileDetailGuy" and I wasn't impressed by their website. I do high end detailing in the Florida area. On their website I see that they use a pressure washer on gel-coat which is a big no-no. In one of their photos they had a Bissel Little Green Machine setup do do the carpets with, and even though this machine is good for light duty, it's not going to offer a deep cleaning that you would expect from a professional.
If you're looking to do this yourself I have some tips top offer if you'd like.