I guess you really want to step up to 44s! (trying to burn through your 42s)
I think having a mechanical actuated line lock like mine compared to an electric one is the better choice for a parking brake out in the rear. However, the nice thing about the electrics is that you don't have to route brake lines into the cab so that's a plus. Cutting brakes would be nice on our big rigs. While it does sound like a lot more connections if you route it well and use good fittings I don't see why it couldn't be reliable. I really dig the swagelok style fittings (compression fittings) and see many thousands of trouble free connections here at work. No flaring involved either.