I have a 2013 Ext Cab Chevy Diesel 2500HD and a 2014 Cougar 28SGS with Resse Hitch that I just brought home this weekend. The truck on both cement and asphalt is porpoising to the point it was making...
We had the same experience this weekend with our TT.
We picked it up and the dealer had filled the fresh water tank 2/3 full without telling us. The water sloshing around caused some porpoising that we didn't expect. We drained the water at the campsite and didn't experience it on our way back.
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