That would be just as dangerous if not more than too much tongue weight.Ever see a truck/trailer start some serious fishtailing on the highway due to not enough tongue weight?Next to impossible to get it back under control once the wagging starts. Center it over the axles, with a slight bit forward of the axles.
Did that once hauling a bobcat. I didn't pay enough attention to how it had been loaded. Hit 55 mph and the trailer started going all over the place. Thought I was a gonner with that one. All I could do was let off the gas and hold on. On the plus side, all the traffic cleared around me until I could get a place to pull over. I've never had so much space around me driving on I-95. NEVER load too far back. Loads need to be centered on the trailer.