When towing is it possible to experience the rear axle trying to roll??? This would only be felt when getting the load moving and really felt when getting the load moving up hill...
I had thought that it might be the clutch jumping but it does not do it pushing the trailer up a little hill in reverse.
Now that our 5th wheel is 2k heavier than the other one this issue has started...
Would a set of ladder bars cure this problem....

Rick

 

Sounds like axle wrap to me... and ladder bars would help stop that...

 

hard part is you don't have 4x4 so you cant take advantage of Low range to gear down things and slow down the driveline speed. Especially when backing up. definately axle wrap. Are you fully releasing the clutch when this is happening or just off the line what are the conditions surrounding it. I would agree though it is axle wrap but could also be a combination of axle wrap and clutch shudder