I am moving from WA to SoCal in a couple of weeks and I plan to tow my box on the back with all 4 wheels off of the ground. Anyone done this or anything like it? Any pros or cons? Just wanted to get an idea of what works and what doesn't. Thanks for your help! :bow:

...I plan to tow my box... with all 4 wheels off of the ground....

Sounds like you are not towing the xB. You are towing a trailer with the xB on it.