What has a shorter range than a Tesla?

A Tesla towing an Airstream trailer, of course.  It's a cool gimmick with one of the coolest campers out there, but having towed a camper myself in the past couple of months, the gimmick just raises a lot of questions where I'm sure the answers aren't favorable to Elon Musk.  For starters, how much below the rated miles of ~200-250 would it get--my guess is about 150 miles at best.  Also, what happens to those motors during towing?  High torque and lower airflow is a recipe for overheating, after all.