I just bought the 329re and have a 07 gmc duramax with 6.5 bed. I did not go with the slider hitch at salesman recommendation. sure glad i listen to him, after hooking up, there is plenty of clearance. have backed in many tight campsites with no prob...
I just had the same issue on my 329re, it took me over 2 hrs to finally find the valve tucked up between the frame rail and outside wall of the trailer on the street side behind the rear axle.
