RE: Solar
Ken, you have a lot of answers so far.  Let me add a cou0ple more comments.
First, the HF setup is old technology, not very efficient.  And iffy on
durability in the weather for long times.  Your customer can get, for a
littl more money, a full kit like this:
http://www.windynation.com/products/solar/solar-panel-kits/100-watt-solar-panel-complete-kit-rvs-boats-and-grid
>
as pointed out by another list member not to long ago.
Second, suggest to your customer that he acquire 12v adapters for anything
he will need to run or charge while camped or traveling.  Mount a block of
12v outlets on
the cabinet behind the drivers seat, very convenient.  Go to eBay for
those, really cheap.
I've had an inverter in my rig for about 10 years now.  I rarely use it and
I camp/travel 60+ days a year.  Virtually all my toys are run off 12v
adapters.
Good luck.