When loading trailers is 15% pin weight for bumper pulls & 25% for goosenecks sound about right for good stable pulling?

 

It's more about balance than pin weight. You need to load your cargo so that you maintain good control and traction over changing road and environmental conditions.

 

without enough tongue weight a BP will fishtail and give you a much bumpier ride. Is 15% the right amount? What about gooseneck?

 

on a goose i figure about 1/3 on the truck, 2/3s on the trailer. on the tounge pulls i just load it up till i am on the over loads.

 

Yes.......

 

Living quarters goose necks we normally use 25%, 15% on goose necks and 10% on bumper. Take it to a scale and weigh the truck with and without the trailer on it.

 

Pin weight on goosenecks may depend on the distance between your rear truck drive axle and the forward trailer axle (known as the "bridge"). My 25' deck over transfers 25% (19 rear 6 to front). However, my 44' enclosed trailer (10 foot longer bridge) transfers 33% to the truck. Position of load may have some effect on pin weight. Do as billmrmi suggested - empty weight of truck on scale (full fuel, and you) -look at your axle weights. Add empty trailer - now look at them - you'll not only see total transfer but also transfer distribution.