gmw, thanks for the kind words -- but really, our Fun Finder is not built for serious off-roading. We do take it on rocky dirt roads, but very slowly -- it can take us an hour to go from the pavement to our remote campsites. We have plenty of clearance, but the frame is not terribly beefy.
So if you want to go for long distances on very rough roads at more than 10 or 15 mph, you will need something stouter than a Fun Finder. I wonder if the Casita frame is up to the task? Casitas are built like tanks -- literally, like water tanks! Very strong units -- bomb-proof.
Robert Ryan from Australia sometimes shows us the amazing "caravans" they drive Down Under -- far superior to anything commercially available in the US.