In this video, I install an auto RV screen door closing device called the Screen Shot. The Screen Shoot is designed to fit right-hand hinged Lippert screen doors. It consists of a spring and a cloth strap inside a plastic tube. At each end of the tube are plastic mounts that fit into the door frame channels.
Unfortunately for me, our 2011 Couger trailer has a Challenger brand door not compatible with the Screen Shot. So I ended up doing a modification to the Screen Shot plastic end pieces and drilled a couple holes in the door frame to make it work.
Warning! My modification will likely void the warranty. Disclaimer: Love Your RV! received this Lippert product sample free of charge for review.