Hitch Dynamic

from RV.net forum:

when the camper is on, the truck front and rear axle weights are far enough above trailer axle weights that the truck will control the trailer well. That's 1 of the two criteria for whether a trailer is well controlled.

The other is a dynamic relationship between the axle postilion and the trailer center of gravity. If the center of gravity is over or behind the axle, the trailer will be unstable. When the center of gravity moves in front of the axle, the trailer becomes stable; the farther it moves forward the more stable the trailer becomes. Eventually the high tongue weight will make the TV unstable so that's an upper bound on how far the weight can be forward. The other part that plays into this is how much of the trailer is in front of the axle vs. how much is behind. For a uniform density like a RV or cargo trailer, it works out well to have 10% to 15% tongue weight. But the trailer doesn't have to be loaded uniformly. Look at a boat: they are very back heavy. Outboard boat trailers are stable with 3-5% tongue weight because the axle is so far back due to boats being so back heavy.

You can steal the same idea if you're having a trailer made. Put a long tongue on it. It will be stable with a lower tongue weight fraction. This can really help when you're using an extension. There's just no upside to putting a lot of weight back there, and if you can shed some of it to the trailer axles, it's a good thing.

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