I know they are low. If you use real world pin weights then a 3/4 on truck is not capable of pulling anything more than an atv trailer by the time you add people and a hitch . A regular gooseneck trailer unloaded probally exceeds the the payload of most. 3/4 ton trucks.
Please don't just conclude that if you need a 1-ton that it needs to be a dually. Going to a 1-ton adds about 1000# of payload, and going DRW adds another 1000#. If you need 1000 more, but not 2000 more, then you don't have to go dually!