You explained it exactly right, rvcycle guy. The original question used a 3124 as the example. This trailer is probably unique in the TM model line when it comes tongue weight, since it is the heaviest trailer on a single axle. A normally loaded 3124 will come in at 600 lbs. tw. The factory hitch receiver on my f150 is rated at 500 lbs. tw, without WDH. That means that even though I don't need a WDH to keep the trailer and TV level, and I don't need it for sway control, I need it to stop over-stressing my hitch. As rv says, even if your hitch receiver is rated at 600 lbs., it's probably a safe and smart idea to get under the maximum with a WDH.
Dave
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