I need to haul 3 ATV's in a cargo trailer, but the trailer is too short.
It's 16.5 ft, right in the middle.

Does anyone have any ideas, plans etc. for building racks that would allow me to piggy back the quads?

Perhaps a rack that would fit over the top rear of the quads, so another can mount over the back, on an angle.

I don't want to stack one on top of the rear rack, just over it.

I have 2 2WD and the 3rd is a 4 WD.

I don't have enough vertical room to stack one completely on top of the other.
The 4WD can be mounted as near vertical as the room allows.