Tekonsha P3 questions

I need to buy a new brake controller if I can't fix my old Jordan and I have some questions that I can't find anywhere in my searches . I know there's assessories for the PIII but is there only one part number for the controller itself ? Does the PIII come with a wiring pigtail that can be mated to the vehicle brake controller pigtail or is it necessary to buy the vehicle specific wiring harness for the PIII ? I have one trailer with electric magnet brakes and another trailer with electric hydraulic brakes . Does the PIII work well with both ? Is there any other good brake controller for both kinds of trailer brakes ? Thanks ,Craig

The P3 is an excellent controller. However, it is not a 'set it and forget it' unit. Mine has to be set for highway travel or around town situations or the wheels lock up in slow in town type of stops. The unit has boost features so it is very easy to adjust.