I'm Wisconsin as well. I only have the one BP though. I considered getting another about 10 years ago but decided not too because hopping around appartments with multiple reptiles would be a pain. Plus, most places aren't thrilled when I tell them my species of pet haha. I've never had to pay extra in rent though like dogs/cats which is nice. To this point, I'm glad I just have the one. Maybe when I'm finally able to get a house I might step things up a bit but I'll revisit that when the time comes.
I usually bag her and keep her in my shirt/jacket when transporting and preheat the car. It's very rare though that I have to transport. Pretty much only when moving for the most part.