I originally was running a Reese Dual Cam on my 35' Jayco and didn't have any problems with it, other than a bent snap up bracket. Reese sent me two heavy duty brackets free of charge and they worked much better.
A few years ago, I found a killer deal on a ProPrice on Craigslist and put it on my trailer. I can say that I have noticed zero difference in how the trailer pulls behind my truck, other than the fact that the PP is much quieter; like a previous poster said, it doesn't creak and pop like the dual cam did. I'm still glad I have the PP because it is a superior hitch, but I'm also glad that I didn't spend $2,000 on it because I would have been greatly disappointed.
FYI, I'm towing with an F250. My trailer weighs around 9,300lbs loaded and had a tongue weight of 1,280lb BEFORE I installed the PP. I haven't weighed it since, but I'm guessing that it's every bit of the 1,400lbs that the hitch is rated for. I've been rocking it for 2 years now with no issues other than it being a real PITA to hitch up in off camber situations. I have a chain setup for the WD bars because I have a toolbox on my tongue. This means that the hitch head can move a lot more freely when disconnected (when trying to hitch up) which can be troublesome when you aren't on level ground.