While building my truck and semi trailer for the show in July, I have found that the current 5th wheel design I use isn't good enough. My design is a slightly modified version of the 5th wheel on the 8285 B model where a pin sits inside a hole in the middle as opposed to an axle in a pin hole. I have found that 9/10 times when I back the trailer, it pops out of the 5th wheel, so I was hoping that someone could share their 5th wheel design that uses common Technic parts, preferably can lock, fits the 19 wide scale and looks realistic. Cheers in advance