This setup scares the hell out of me. By mounting the legs to the side of the bus, ALL of the weight (and drag) is imposed as shear stress on possibly the weakest part of that wall. That beautiful arched roof can bear SOO MUCH compressive stress, I don't know why anyone would mount these posts to the side-wall. If you're going to do it, do it right. Mount the feet on the top of the bus, through-bolt them with big washers, and seal the crap out of them.
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