How do you know you need that stuff? What I have is an F-350 crew 7.3 diesel auto 4x4. The trailer is a 31' 2 axle toyhauler. Empty is 6850 GVWR is 9900. It's 10' 5 " w/o AC unit but I do have one. All I have on my truck is the (class 3?)hitch that I've used to pulled a 10YD dump trailer, 7x14 enclosed trailer & a 17' aluminum flatbed trailer.