I think you'll find Arctic Fox units are built very well and will withstand the rigors of rough roads as well as any brand, and probably better than a lot of them. Their frames are quite heavily constructed, as are other aspects of their products.
For back country use tho, look carefully at what you want to do, or where you plan to go, as thAt trailer is actually about 35' long, if memory serves me correct. That will limit your accessibility to some destinations.
Arctic Fox trailers are notoriously heavy. You ell NEED ample truck to tow it. Plan accordingly.
Finally, as mentioned before, go to the Arctic Fox Owners Forum, you'll get plenty of good info there. www.afnash.com
best of luck to you.