Took our 1181 to Alaska in 2009. No problems. We've boondocked with it in all sorts of off-road conditions but found it more useful to work our way up and back using RV campgrounds. There were lots of possibilities for boondocking in AK but more convenient for many adventures to use campgrounds. Town of Seward and Denali NP, for example.
Biggest problem with heavy camper was frost heaves in highways. It took a toll on our pickup bed and tie downs. Just a pain to pay such close attention to upcoming road issues.
Rick