pics would help and this sounds like a popup-specific item, not a general item for all RV's.
post a similar question in the Popup section and you'll probably get more responses.
you might want to also post your question on Popup-specific forums, like Popup Explorer or Popup Portal.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC