Not fitted on ours, but I doubt it would help much. With the awning down enough to do any good the door and also the screen door are jammed at the top. A roller might help if the awning is only down a little.
Only thing that works for us is an extra curtain hanging from the awning with the awning up enough to let the doors open/close. We use a shower curtain rigged at the sunny end for late afternoon with some bungee cords and clamps.
It could all be avoided if the door would open inwards like in a stick house, but no--- :( I guess they figure the door in an RV won't have an overnight snow bank up against it outside so you can't get out in the morning.