Bought receiver tube from autohouse on Mcdowell road.Welded 2 I beams accross rear which fit inside rear I beams of 5th wheel. Then ran receiver tube about 3ft under trailer and to I beams. Also tagged rear bumber,but main support is beams.Later came back and added 2ft skid plate,so I can drag the rear and not lose anything.I soldered an RV plug brakes and lights,so I have trailer brakes on one axle of my double. I am a little over when I pull,but no problems,been to Buttercup,and CA has never stopped me.In Az I pull to Flag,Williams,Page,and down south and as long as it looks reasonable,and the equipment looks professional, I think your good to go.I take a Ranger,2 Grizzely's,Kymco 110,Honda 90,Honda 400,when everyone goes...gotta love-it. I also carry about 90 gals of fuel,so I NEVER go into stations pulling doubles.