My initial thoughts are you are going to need far more than 1000 lb. spring bars. With a 15,950 lb GVWR, even at a 10% tongue weight, that is going to be close to 1600 lbs. At 12%, that would be a 1900 lb. tongue weight. Blue Ox does offer 2000 lb. spring bars. http://www.etrailer.com/dept-pg-Weig...0_lbs_GTW.aspx
If maxing the trailer out, then 1700 lb. bars may work OK....depends on what you plan on carrying. The thing with tow haulers, as you load up the back, the tongue weight gets less.
Another thought: Make sure the receiver is up to the task. There should be a sticker somewhere on the receiver that states the stats.
Note: Looks like youroo posted while I was composing.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263