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Kent and Jan,
I can't tell you which way is best but I can tell you what I did.
I used the Hayes-Lemmerz air over electric brake controller. I tapped into my Volvo's air lines located behind the instrument panel. Very, very easy to do. Then just integrated the electronic side of the Hayes-Lemmerz controller into the truck's electrical system using Volvo's wiring diagram.
One of the benefits of using an air over electric controller is you can maintain the functionality of the Johnson bar on the dash to control your trailer brakes and never have to touch the brake controller itself.
I don't know of an air over hydraulic system that bypasses the electronic controller in the middle. Maybe there is but I have not heard of one mentioned.
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