Ok, think I found my anwser to the question I was asking, This weekend went to a BBQ up in the mountians (couldn't pull my Trailer

) everyone pulls there trailer up for the weekend, here came a mega cab with a 36' whipping around like he dosen't even care about the back of the cab. So had to go check it out, and there sat a B&W Companion in it's farthest position away from the Ball and no extension on the king pin, measured his kingpin back to his front cone on his trailer and would you know on my trailer I have almost
5" more clearence on my trailer. So the anwser is the B&W Companion on a Mega Cab will work fine. Will Post when I Actully hook up and will post pictures. Thanks for all the great info.