Here's the stickers on my truck.
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I'm #400 under GAWR when hitched up, but my trailer only has around #650 TW when loaded up.
I'd expect your TH to be at #1000 TW just to be 'balanced' enough to tow half way decent.. Your WD hitch will transfer weight off the rear axle to the front axle and the trailer axles.. Think of it like a wheelbarrow.. The front wheel is the trucks front axles, the rear skids is the trucks rear axle, the handle bars are the WD bars and your legs are the trailer axles. The load in the wheelbarrow would be your TW and stuff in the truck.
When you lift up on the handles, it removes weight from the skids and puts it on the front wheel and your legs. Same basic concept.
Good luck!
Mitch