Here's how I did mine, which worked great with my old camper. (was a bit short for my current one, so I had to redo)Beers have been involved, WATTS.
Yes, 2.5" receiver... I'll see about building one.
I bought a Curt receiver tube like this:
![71njvUl1sZL._AC_SL1500_.jpg](https://f.media-amazon.com/images/I/71njvUl1sZL._AC_SL1500_.jpg)
A trailer wire extension like this: (you can get them in several lengths)
![71yJPXs4viL._SL1500_.jpg](https://f.media-amazon.com/images/I/71yJPXs4viL._SL1500_.jpg)
Then some 1/8" steel for the wire, and 1/4" steel for the safety chain loopy thing. Drilled a hole for the pin into the truck, and with the shorter version that was it. When I extended it, I added the chains and turnbuckles since it's getting pretty long now.
![1000003419.jpg 1000003419.jpg](https://www.rme4x4.com/data/attachments/136/136171-67f9774d586e7278cf260227538d44c7.jpg)
![1000003418.jpg 1000003418.jpg](https://www.rme4x4.com/data/attachments/136/136172-205a44918ca0da011f58605b325e62c9.jpg)