Structural design issues?
We recently took our 2011 Passport by Keystone trailer to have the wheel bearings checked and greased. Upon inspection, the repair folks found cracks in the I-beam frame above all four wheels. We do...
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It's been on here before with photos for reinforcement/welding. Poor design as far as I'm concerned. The side force of the suspension that is welded under the bottom plate is acting like a lever and twisting from side to side. Some people weld in reinforcement plates from the bottom edge toward the top. Other option is to try and "box" the frame to make it more rigid.
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