I'm kind of like Ron. I've looked at the Bank systems and concluded they were pretty costly and could be dubious as to complying with emissions standards if you were in a particularly picky state. My wife and I went out to the Canadian and US Rockies last year and criss crossed the Continental Divide several times with a Chevy HHR in tow. Using the Ford Tow/Heavy Load setting on the auto tranny, I never felt any problems with power crossing the mountain passes. In fact, since I was limited to 65mph by my tow car, I got a real kick out of passing the semis on the long climbs that had blown by me earlier on level roads. I have found the Ford V10 to be up to the challenge without extra power.
Jerry