We also pull a 3121RL. We have a Ram 3500 Dually LB with a B&W Companion hitch. On the truck we have airbags. The trailer's pin box is a Road Armor Trailair. With this setup I have NEVER had any chucking. As compared to other setups I have had in the past, this is by far the best configuration.
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2018 Ram 3500 Laramie Longhorn 4X4 Dually Cummins Aisin CC LB / B&W Companion hitch
50 Gallon Transfer Flow in bed tank w/ Trax 3
2018 Montana 3121RL
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