1. David Avard
    August 25, 2019 @ 12:29 AM

    One other factor you didn’t mention is the sensitivity of tandem torsion axles to hitch height (and the axles being level).

    My club has a custom 28′ trailer that the builder unfortunately put the axles in the center of, and some people had no problems towing it and for others it was a nightmare. Someone who works on trailers (for semis) suggested that it was related to the height of the hitch changing the effective length of the tongue (ie: when the trailer was tongue low, the front axle carried more weight and when tongue high, the rear axle carried more weight. This changed the load center of the trailer and made it unstable when tongue low or less unstable when the tongue high.)
    We confirmed some of this by measuring the weight on the hitch at various hitch heights. With a 10,000# trailer, the tongue weight varied by 500# (800#-1300#) over a 6″ variation in hitch heights (3″ +/- from level), with it weighing around 1050# when level.

    I’m sure I didn’t phrase that in correct engineer-speak, but you should understand the idea.


    • The Mechanic
      August 28, 2019 @ 4:28 PM

      You communicated the situation, and that’s more important the the “engineer-speak”! You bring up a great point, and you’re exactly right. Thanks.


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