but those charts is what the "off the production line" measurements are.
All torsion axles have rubber rods.
Those rubber rods start giving out even during production.
The older the trailer, the more the "give out", or failure if you wish.
If the trailer is not used for a couple of years, the rubber rods usually solidify, making the true meaning of a "torsion axle" USELESS. Those rods after they fail, will provide ZERO cushion for any road bumps.
In time, ball park 25 years, all torsion axles will experience RUBBER ROD failures.
When those rods start failing, THE BALL HEIGHT CHANGES, by up to 3 inches and sometimes even worse.
[COLOR="red"]The ONLY way that a true "ball height" can be determined is by measurement.[/color} That is level the trailer, then measure from the inside top of the ball mount, to the ground.
Compare that to the above charts and you will see that the numbers DO NOT MATCH.
Having a level trailer is EXTREMELY IMPORTANT, when it has more than one axle. If not, then improper weights are on each axle. A tandem should have one half of the trailer weight on each axle, and the tri-axle trailer should have pretty close to one third of the trailer weight, on each axle.
When the weight is unbalanced, one axle will usually have it's weight rating exceeded, and the other axle, not nearly enough of it's actual weight carrying capacity.
This causes basically three things.
1. Loss of control because of improper weight distribution, because of sway.
2. Ruining of one axle
3. Begging for a tire "blow out" because of excess weight on one axle.
Improper weight distribution that causes a sway or loss of control, cannot be eliminated by any type of sway control on the market today.
The SUPER SAFE way to determine a ball height, IS TO MEASURE EACH TRAILER, regardless of age.
And yes, in time, the ball height actually decreases, therefore a periodic ball height adjustment is mandatory "ALWAYS", except for single axle trailers.
For those members on this Forums, that are safety conscious, please report back on this Forums, the ball height that you have that differs from the "out the door chart"
The object ??
To make others aware that ball heights are different for each and every Airstream, regardless of the year and/or length, or what someone else may measure for the same exact trailer.
Lets all gang up and bring SAFETY to the forefront for every Airstream and Argosy owners, for 2016.