Oh, sorry It's just a hitch that we had installed at the local UHaul. 1.25 inch size, nothing else fancy about it.

Upon further investigation, it really does appear that it's a 2 inch reciever with an adapter...which I find hard to believe, since 1) Thule doesn't make the adapters themselves, and 2) I bought the box and set it up myself...with no adapters :/