Slide Tubes/dumb question

[Round2-40]

In my Eagle 328rlts the bedroom slide has a sticker saying remove slide tube before opening slide and return before towing. Have looked all over and cannot find
just what am I missing?

[Crabman]

They are called slide locks. You put them there to stabilize the slide when traveling, b ut must remove it before extending the slide. It should have come with the trailer if new.