160-180 lbs nose weight sounds a lot. About 100 would be my preference
for stability, 50 or less to make it easier to manhandle but with some
sacrifice of stability. According to my car handbook, max permitted
nose weight is determined by the manufacturer of the bar (tongue) on
the front of the trailer. In my case (Lak 17), that is 100 kilograms
or 220 lbs, but I would not load it up at the front anything like that
heavily.

Chris N.