My 5th wheel shudders violently when towing.
I have a 2015 GMC 2500HD Crew Cab diesel with a B&W turnover ball hitch and a B&W companion hitch towing a 2006 Cedar Creek Silverback 29LRLBS (unloaded weight of 10,070 lbs. The hitch was installed ...
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I had a very similar experience with my 2012 Duramax (basically same truck) with B&W Turnoverball and Andersen Ultimate. I found that the B&W was not torqued properly when installed allowing it to move ever so slightly. Check that all the bolts are properly torqued especially the ones that attach to the side plates under the wheel wells.
