The pins on our unit are just safeties--there is no tension on them at all.
We have a thick foam mattress for that bunk. I just take it down for travel (it's a trifold so I can remove it easily). When we are camping we leave the mattress in and only raise the bunk until the bedding hits the ceiling. In the evening I lower the bunk all the way to reset the timing.
So far, after 3 seasons, it is still rock solid.
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