Originally Posted by eng45ine
My assumption is that those two cables signify that when they are tight, you've raised your camper enough.
You only raise the roof until that cable pulls tight, any further and you have over extended the roof and your door won't fit, canvas might rip, etc.
Mine only had one, but if broken you can probably replace with a section of aluminum aircraft cable available at your local Lowes or Home Despot. Just measure carefully when crimping in place to get the length just right.