On this one you're wrong.
That trailer (it's right outside my back door) puts ~250lb (by my pin scale) on the ball EMPTY; gross on the trailer (empty) is under 2k. Right where it should be; about 12%.
Unlike most this one is actually built right in terms of balance right out of the factory. Yes, I checked it before plunking down the money. Who you buy a trailer from matters.
Fully loaded at 7k gross with the load properly distributed in the trailer I'm just under 1k on the ball. 15%. I moved my entire house over the space of a month or so between Florida and Tennessee (multiple trips, of course) with this rig. No 1/2 ton class truck I've ever seen will carry that safely on the stock suspension. The 1/2 ton class Chevys (e.g. 1500 Suburban, Silverado, etc) from the era of my truck (mine is a half-ton Suburban) are only rated for 500lbs on the ball weight-carrying but are also rated for 7000lbs of trailer and 12k GCWR -- it's not the receiver that can't deal with it, it's the rear suspension -- the springs are nowhere near stiff enough and the lever arm is just too long. You can bag the rear suspension or change the springs and a bunch of other stuff (but changing the springs destroys the ride quality when you're not towing, never mind violating the placarded maximums for the vehicle and thus potentially voiding your insurance if there's a wreck) or buy a weight distributing hitch. The hitch is cheaper than properly doing the suspension work (by a lot) and you get sway control at the same time.
You can safely pull a 7000lb BOAT behind that truck without weight distribution due to the aerodynamics and how a boat's load is distributed -- you can run 7% or so of a boat-and-trailer on the ball (I owned a 23'er that scaled right at 7k full of fuel and such) and you won't have trouble, never mind that nearly all boat trailers are surge braked simply because electric brakes with immersion tend not to last very long.
If you have a truck rated to carry 1k on the ball then you can pull a 7k load properly distributed without WD and it'll be fine but there are darn few 1/2 ton trucks in a stock configuration that are rated to do that. Mine sure as hell isn't.
The premise behind WD is that it takes a significant part of the load off the ball and shifts it forward; it's a leverage trick, basically. Most also come with some sort of sway control but not all. The receiver portion still has to be able to handle the total dynamic load placed on the towing vehicle (as well as however the hitch is attached to the vehicle), of course and the trailer has to be able to mount the brackets required as well. If you're going to try to pull half or more of the mass of your vehicle, as the OP appears to be intending to try to do, and especially if the tow vehicle is short-wheelbase, then stability is at a premium. You definitely do not want the trailer driving the car!