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The noise from the bed was driving me nuts so I did a little looking and believe I found the culprit. Not sure if this is the case on all the 520's or just depends on how they are assembled.
Cause: Where the latch engages on the bed, the hook is long enough that it makes contact with the other side of the latch causing a metal on metal area that give the squeak. See below:
Fix: Grind off small portion of the hook so it doesn't make contact on the backside any more. Doesn't take much, maybe an 1/8". I didnt get an after picture but here is the before and you can see where it was rubbing.
I only had to do this to the driver side latch as the passenger side wasn't rubbing and already had some clearance.
Hope this helps others with "squeaky beds"!
Cause: Where the latch engages on the bed, the hook is long enough that it makes contact with the other side of the latch causing a metal on metal area that give the squeak. See below:
Fix: Grind off small portion of the hook so it doesn't make contact on the backside any more. Doesn't take much, maybe an 1/8". I didnt get an after picture but here is the before and you can see where it was rubbing.
I only had to do this to the driver side latch as the passenger side wasn't rubbing and already had some clearance.
Hope this helps others with "squeaky beds"!