I have the Primus IQ. Here's a link to it in Campers World:
http://www.campingworld.com/shopping...-control/43938
It was quite easy to set up, but I seem to remember needing the Ford Brake Control harness to hook it up (another $18.00). It works quite well, and the digital readout tells you you're hooked up properly.
There are more expensive ones, like one that works when you're in reverse, but since I don't travel very fast in that direction, I didn't see the need for that feature.
- Jack