When do you want or need a WDH and/or brake controller?

Thanks for the replies!

The truck doesn't currently have a brake controller. From what I reading, the wiring is present, but I need to add the actual controller, and then need to have a dealer flash software on the computer to "activate" it.

I think I'll start with that and do a few easy runs before deciding on the WDH. Thanks again for all of the help!