I use a Reese Dual Cam system and get virtually no push/pull with my 29' trailer. It is 7500-8000 lbs loaded and has 1200-1300 lbs of tongue weight. During my fist summer with this trailer I had issues with the dual cam mounts and had to remove the mount on one side. So I had a normal bar with a chain on the drivers side and still had the dual cam on the passenger side. I did notice it had more push pull like this, but not bad. It was worst driving around Boston in heavy traffic with semi's on both side. We drove it home to Michigan like this. After beefing up the dual cam mounts, I have hauled the trailer thru 32 of the lower 48 states with no issues. I love how the Dual Cam performs, but the mounting system leaves a lot to be desired. Mine is good now but it took some modifications to make it robust enough for me.