UPDATE: Been remiss to post this so I'm playin' catch-up here. My choice to use some U-channel material I had kicking around to then weld into a box-channel for the trailing arm air-spring mounts, came back to bite me in short order. You can see in this pic how much the deflection load bent the one on the left. Fortunately, I designed the upper forward mount for these arms to easily be bolted/unbolted to for servicing. So a year or two ago now I finally decided to use the heavier (much heavier) box channel on the left to get busy and build new ones. It required drilling through oversized bolt access holes to get at the bag-mount nuts.
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