Have 2005 extcab Chev 1/2 ton V8 gas with towing package; hitch says max tongue weight 600 lbs, 6000 lbs tow capacity w/o WDH. Looking at '15 Jayco WHITE HAWK 26RLS LENGTH: 30' 11" and 2015 JAYCO ...
What does the black/yellow Tire Loading Info label say near your driver's door as far as "Occupant and Cargo must not exceed"? That is your max payload rating and is the starting point. You are likely to exceed that long before you exceed the Tow and/or hitch rating. Add passengers, fuel, "stuff" and hitch weight. Subtract that from your "Payload" What's left is the trailer tongue weight you can carry without exceeding ratings. Hint - it won't be 945#!!! Good luck