Interesting concept but in use reality might be a tad different story.
I have a swing away hitch and a tote box on a Class 3 hitch with a hitch tightener -
https://www.stowaway2.com/hitch-tightener
that stabilizes the platform and box. I sure wouldn't want to be trying that Hitch Hotel without one of them.
Getting it on and off the hitch would definitely be a big problem - it takes 2 of us to put the platform into the hitch receiver and then add the box, sure wouldn't want to be trying to place 240 lbs in to the hitch receiver.
Not all vehicles can even be equipped with a class 3 hitch and some have not got anywhere near the suspension system to support that kind of weight hanging off the back end.