My slide topper water pooling problem still hasn't been solved. The slide out itself is out of adjustment and the cut out for the slide has to be properly fixed at the manufacturers plant. After the fix I am hoping that proper alignment and tension will correct the water pooling problem.
You may wish to have more tension added to your slide topper. At dometic's suggestion Camping World gave this a shot on ours.
If all else fails I am looking into a product called the Air Wedge. This product inflates and slides under the slide topper. With a large slide you may have to grab a broom stick to nock out a beach ball. The Air Wedge appears to be easy to install and remove. It also appears very visible making it easier not to forget before bringing the slide in.
Check it out here www.awningairwedge.com