Should be able to. When looking at part #'s for rails to go along with various 5th weight ratings you will see it is the same part number. I guess it depends on on how heavy of a rating you are going to. I have a 16k hitch it and its rails fit 12k to 20k hitches. My rails even fit my 25k goosneck hitch.I currently have a RBW lil rocker 15K 5th wheel hitch installed in my truck and need to upgrade to a higher rated hitch. Does anyone know if I can use the exsiting rails for a larger rated hitch.