This is my set-up: 96 GMC 2500 Ext.CabW/Long bed 1999 Terry 5th Whl 25 ft. 14 1/2' Aluminum boat with 8 H/P Evinrude (mounted) Standard small boat trailer, 8" wheels, lights and ball connected. Had to make my own cause coudn't find one. I drive Oregon to Arizona every year with it. Mileage is little better cause boat sits upright on trailer and splits wind ahead of RV. No chance of me making another one. (I'm 75 and won't do much for anybody anymore) However if there is interest in this I think a local machine/fabricating shop might do it.