Just got back from our cabin and I was able to get the solar system installed and working. I went with a roof mount for the panel; finding a pole mount system that would be tall enough to clear obstructions was just too cost-prohibitive. I may not get 100% of the panel's output from the roof mount, but I could buy a second panel for less than it would have cost me to go with a pole mount.
I built a locked battery box for the two flooded deep cycle batteries under the cabin, leaving ventilation holes to allow any gas to escape. (I covered the openings with galvanized cloth, lest any critters decide the battery box would be a nice place for a winter's nest!)
For now, I've left the batteries attached to the charge controller. The batteries weren't at 100% charge, so I didn't want to leave them in that state over the cold winter, and they should charge nicely between now and the time the temps drop. The charge controller has a temp monitor and overcharge protection, so I should be OK. In any case, I'll find out next Spring when I return!
I installed a number of LED fixtures, which were a big improvement over the existing propane lanterns. I'm hoping the LEDs cut down a bit on our propane usage.
Anyway, at this point, I'm pretty happy with the outcome. The kids are already petitioning for a TV w/digital antenna up there, but that ain't happening!
Thanks all for your help!