"Steven Shelikoff" wrote

That's assuming it's a perfect theoretical lever where the weight of the
lever itself is 0, which it's not. The actual answer is "it depends".
For example, if the tongue weight is currently 10lbs and you double the
length of the tongue but the extra length weighs 20lbs, you'll be
increasing the tongue weight. But if the current tongue weight is
1000lbs and you double the length same as above, you'll be decreasing
the tongue weight.

With a real world trailer, doubling the tongue length would cause the
new tongue weight to be somewhere between (old weight+weight of new
tongue length) and (old weight/2) but never actually being equal to
either of those unless you use some sort of extra load leveling device.

Steve

Right. And in most cases the added tongue material (in our case about
7 lbs/foot) is minimal compared to the tongue weight 400#.