School me on 5th wheel hitches please

The other thing I learned is that the potential chucking distance of a 40' versus a 30' trailer is not significant. The difference is about a quarter of one percent (the 30 foot trailer chucks a quarter of a percent further in terms of distance, for the same vertical articulation). So my interpretation is that short trailers bounce more and with a higher amplitude due to reduced moment of inirtia about the axle. Conversely, the longer trailer will have moderated lower amplitude chucking, not because of hitch geometry but because it doesn't rotate as easily about its own axle and therefore tends not to squat the TV as much, for the same bump in the road.

Those who have actually towed both short and long please chime in. This is just theory...