with that much weight, and IF you are planning on doing this more than once, have UHaul install electric brake controller. It's hard on your brakes to stop that much weight, and in some states there are weight reqments for that. The rest is easy. The rental trailer should have a 4, 6 or 7
prong plug and adapters if you need them. & is most common especially if you are using E-brakes. ...