Before adjusting the tensioner on the end of the roller, on a level area, fully extend the awning and inspect the awning surface for any buildup of dirt/sap/pine needles, etc. especially on the side that is pulling in more, in your case, the rear. If clean, or after cleaning, extend and retract the awning a couple times to see if it resets.
Next, try the fix in the video bigriver linked . That might fix it.
Here is a link to another thread on the subject:
https://www.sportsmobileforum.com/fo...way-11559.html
If the end of the roller tensioning in the videos does not work and the awning panel is still not retracting fully on one side, one fix is to add an approx. 3" wide by 6" long strip of thick clear gear tape to the upper surface to create more purchase on that end as the awning collects on the roller.
Place the strip - 3" goes in the extend/retract orientation/6" goes along the roller orientation - on the open awning at the edge close to where the awning goes onto the roller. Retract the awning to see how the panel closes. You may find that a couple of strips layered atop each other is required to achieve an even roll up into the case so the extending case panel rests in a snuggly closed position.
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