I wouldn't be too sure of that Dennis unless you've actually tried it.  Running a 5-Amp window unit for 7-8 hours, with inverter losses, calculates to way over 300AH.  I think you'd need two pairs of GC-2's to make that feasible and have batteries that last more than a summer.  And that's a bunch of room!  The 12VDC systems are nice, but real spendy.

That said, we live in Phoenix, so we virtually always camp where it's cool, and never need more than a couple of fans.  We camped in Florida one August, for a couple of nights, and quickly decided a Motel was the only way to go there.  For those of you in the Midwest and South, I feel for you.  Mostly we camp on the West Coast anywhere from Monterrey to the Puget Sound, or in the Rockies.  We've done tons of research to find campgrounds with power when we need it for heating, and have found plenty that are not "RV parks".  Plenty are, and we use them occasionally to sleep, shower, and head on our way.  If I can sit next to the van and toss rocks in the Pacific, I don't care if "purists" snub it as an RV park.

Others' mileage may vary, but if a time comes when I give even a fleeting thought about what a group of RV'ers think of me and my Westy, please just shoot me.

Keith Hughes
'86 Westy Tiico (Marvin)
 
 Date:� � Sun, 27 Oct 2013 09:08:20 -0400
 From:� � Dennis Haynes <d23haynes57@HOTMAIL.COM>
 Subject: Re: idea?
 
 If you plan to dry camp you will need the space under the
 back seat for
 batteries and the inverter. A pair of GC-2's and a 2,000
 watt inverter will
 get you through the night. If willing to invest there are 12
 volt AC
 options. Also if the original AC system is intact a 110 volt
 compressor can
 be added and with a 12 volt power supply and a good control
 scheme use the
 existing condenser and evaporator.
 
 Dennis