Good description, Larry. We will continue to ponder it.
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I am suspecting that after 17 years of use, the weight of the front shell has stressed the lift arm so that it is now bowed outwards. In the non-slide models, the box would have kept this straight.
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If the lift arm is bowed outward, can you un-bow it in any way? If not, new lift arms are a lot cheaper to buy and ship than new torsion bars. And I think that unlike torsion bars, they are the same for all models, so you would be guaranteed to get the right parts.
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Terminology check. When I say "lift arm", I am referring to the white rectangular arm that is attached to the torsion bar at the lower end, and the shell at the upper end near the pocket stop. Each shell has four lift arms, two on each side. I believe this is your usage as well.
When I say "box", I am referring to the five-sided box that forms the body of the trailer - floor and four walls sitting directly on the frame. I am not referring to the pull-out box that is up front on a slide model.
Bill