Welcome to JOF
As you stated the GVWR of your 2015 28DSBH is 7,500lbs, so worst case scenario would be a recommended loaded tongue weight range of 975lbs to 1,125lbs (13% to 15%).
Using your UVW ship weight of 5,895lbs + 100lbs (dealer battery, etc.) + 700lbs (cargo, no-fluids) = 6,695lbs........, so a recommended loaded tongue weight range of 870lbs to 1,004lbs (13% to 15%) . The 28DSBH is a 32ft. long TT, a loaded tongue weight closure to 15% would enhance TV handling under less then ideal towing conditions (road, weather, etc.).
I would recommend either a Reese Strait-Line brand WDH or a Equal-i-zer brand WDH, rated at 1,000lb minimum. Both brands/models have integrated sway control and don't require any hardware removal when backing.
Once you have your TV/TT combination under loaded conditions, a CAT scale visit will tell you everything you need to know..., especially that your WDH of choice is adjusted correctly.
CAT scale how-to: http://www.jaycoowners.com/forums/f3...v-tt-3871.html