I suspect that part of the reasoning for axle placement is to minimize big changes in weight on the pin for towing stability purposes.
I have a 2012 Voltage 3200, and the pin weight of the unloaded trailer was around 2,700 pounds. The pin weight of the trailer loaded for vacation with one 650 - 700 pound ATV, one 275 pound dirt bike, several hundred pounds of tools, riding gear, camping gear, dog food, etc. and about 40 gallons of gas in the gas station, and about 50 gallons of water only reduced the pin weight by about 100 pounds. Almost all of the payload goes on the axles.