Agree. It is probably still true that many Superchargers in more remote areas are still not very busy, it used to be the norm that I would pull into an empty Supercharger, but not anymore.OP can take a look just at the pics of Range and Charging While Towing a Trailer - 2016 Tesla Model X Long-Term Road Test to see the possible issues.
I've seen plenty numerous SCs where you can only back in with no trailer attached. Otherwise, you either need to park sideways and block multiple spots and SCs or you need to detach the trailer first.