I ordered a P3 (I think) right before we traded in the 99 f350 on a 2008 f350. Took it out of the box, never installed it. I’m not sure if I can return it or not.
The 2008 f350 has a built in brake controller with 4 auxillary switches that do something unknown. We have a 4 horse with 12’ short wall thats about 10k lb empty. We will be hauling a lot of rural 2-lane roads, some with a 70mph speed limit.
Should we use the built-in controller or install the P3?