Mine also go down though I have fitted two more which helps recovery in a tideway, and if one goes I normally have the second
I was thinking of use a bit of rope from the top, back down to the trailer, it would only work in one direction not two, but that would be at least an improvement.
I did think that it was some sort of safety feature that they got knocked down if hit, also if I did fit some rope, it could get tangled up with the trailer if the rope became slack.
My though was that they really ought to be flexible fibre glass poles not galvo steel, they could then absorb the impact better. However when I asked RM trailers they didn't have anything like that on offer.
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