Originally Posted by pgandw
My Coleman PUP had the same wire - but a manual winch. I think I busted the wire once cranking it up too hard. In any case, I would find the length for the wire by lifting the roof to the point where the door just fits correctly when you install it. That would probably be more accurate for your camper than anybody else's measurement.
I do hope others will chime in with their measurements to give a starting point.
2019 Flagstaff T21TBHW A-frame
2008 Hyundai Entourage minivan
camping Colorado and adjacent states one weekend at a time
Use this method to determine the length. When installed correctly it will be visually snug, not tight. If too much tension it will pull the screws out.
Locate it where you can see it while cranking/lifting the roof.