I recommend removing the front cross bar and spraying some penetrant in the slot so you can adjust the length. Although I am unfamiliar with the geometry of your wagon, it would make sense to move the front bar forward. Not sure how often you intend to use the roof rack, but it may make more sense to install the cross bars only when you need them. Otherwise, leave them off so the slide mechanism doesn't rust.
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Fred Hoelzle
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