5er sways over 65mph

BillPenn wrote:
Have a 2014 Dodge 2500 Crew Cab 6.7L Diesel pulling a 32’ Thor 5er (dry weight 11500). New truck pulls great with plenty of power to spare. Only one problem, if I get over about 65 mph the rear of the trailer will start to noticeably sway. Can’t feel it in the truck, but you can see it in the mirrors. If I slow to below 60 mph it will stop. I replaced my tires this year with new Good Year ST225/75R15 load range E, and have them inflated to the recommended 55psi. With the trailer hooked up it sits fairly level, maybe a little down in the front. Any suggestions on stopping this, or is it normal? Not looking to do 90 but would like to maintain the speed limit.

The E rated tires sound like they are under inflated to me at 55 pounds. But I am running G rated which I have inflated at 100 pounds (max 110) so I am not sure about that.

You need 20% - 25% pin weight. The only way you are going to know what you have is by going to a Cat Scale. Use the following fill-in-the-blank site after you get your truck weight and your combination weights and you will know all you need to know. When you go across the scale they will probably charge you $10.00. They will print out a scale ticket that breaks it all down for use on the listed below form.

http://www.towingplanner.com/ActualWeights/FifthWheelCatScales

Hope this helps.