I'm pretty much in agreement with Jon on solar for these coaches at this time. However, here is a link to a site that I believe will have some application in the near future and great promise in the long run.

http://www.powerfilmsolar.com/index.htm

Look at the application for their power film to architectural fabrics, like our awnings.

Seems like this is beginning to address many of the issues like:

-Cost/sqft of collector
-Large enough collector surface to matter
installation and attachment to the bus (don't want to put holes in the bus)
-Collector efficiency. My last contact with them suggested that hey were working a coating to allow photon collection from both sides of the crystals. They were able to take advantage of direct and back-reflected energy.
-Manageability in that the systems for awnings and slide tops and coach roof is already managed.

Additionally, they have power film integrated into membrane roofing material. I believe that will open up a whole bunch more avenues in the mortorhome and marine industries.

I keep looking at this. I think that there is promise. I think that in the not too distant future, we will have greatly enhanced boondocking capacities because of this type of innovation.

As Jon said, PV electricity is not cheap. On the upside, battery storage and inverters are already installed in your bus and the PV sources are add on to what you already have.

You might also look at a solar supplemental water pre-heater. I started with this on my solar house and added a solarium during the design stage. I supplemented those with electric, high efficiency, ground-water sourced heat pump and high mass flooring. About 3000sqft and cheap to operate. The nice thing about doing solar is that there are a lot of right answers.