I checked and my 2014 Dodge 3500 long bed diesel the difference in weight rating was only about 500 lbs more Duels are not necessary but would be much safer and stable in a blow out situation funny tire rating goes down when on a dual I get the SRW comment all the time I am towing a 2016 39' Momentum 350 max weight 16'500. I think at the scale I am about 3'500 to 4'000 lbs in the bed I think dodge rated bed weight just over 5'000. its all within limits. don"t mention Class A non commercial license here in Calif and half the usa SHHHHHH