I think a trailer tongue should weigh about 100 lbs, or more.
I have moved a trailer axle backwards, because it was too light ("perfectly balanced, he said"), and oscillated too much when loaded.
My current trailer I moved axle forward to lighten tongue load - it was too heavy to pick up easily, and didn't roll well on the cheesy plastic wheel up front.

Think about this - what company has most experience with the "average guy" and a trailer? -- UHAUL.
What does it say on every trailer they rent? - "Load most of your weight in front of the axle".