Melissa, I appreciate the perspective you bring to driving while towing. And while I've never driven a semi -- nor do I intend to -- towing pull-behinds for many years, and now driving a 31' motorhome, I've found that things are quite different. I sure don't drive the motorhome down big grades the same way I did when pulling a 26' TT.
I hope that Barbie has done her homework with weight distribution in that U-Haul. If she doesn't load it properly she could end up with a serious "tail wagging the dog" situation.