[Alton]

I hope I'm not duplicating my message. I lost my server just as I submitted my problem a few minutes ago.

When towing my fifth wheel,9500-10,000 pounds, at 22-27 and 35-42mph, I get a violent front to back shake. It feels like the rear end bounces like a rubber ball. It is scary. The rear u-joints have been replaced, new tires, new shocks. I have a carrier bearing and rear transmission mount ordered( Jim Amderson's suggestion).

Any suggestions will be appreciated.

My rig is a 96, 4x4, 3/4 Hd, 5 speed. 100,400 miles. I've towed the fifth wheel from the time the truck and trailer were new. The fifth wheel and hitch have been eliminated as the source of the shaking.