I have a half-brother who is an OTR driver (Owner/Operator), and years ago he explained to me the relationship between the wheelbase of the tractor/towing vehicle versus the length of hitch point and the centerline of the axle(s) on the trailer.
And in real life it makes a lot of sense, as it's much harder to back-up a short trailer with a long wheelbase vehicle (example, a jet ski trailer with an extended cab pickup with an 8' bed) than it is to back-up a long trailer with a short wheelbase vehicle (almost every tractor-trailer rig on the road).
Farm wagons, on the other hand, are just a PITA, in my opinion!