slide topper drainage

After losing a topper by following the directions I was told by selling dealer, "just retract the slide and it will ALL just roll off", well-mine DID NOT and the topper (due to weight, I presume) was actually pulled into the coach...end up having to get a mobile RV guy to fix. It had to be cut and pried out. This is within 2 months of buying the coach. Any way, I made a broom head attachment on the end of a pole and use it to "sweep" the topper after each downpour. It only takes a few minutes and easy breezy to do, plus I have peace of mind that-the water pooling issue will be put to rest and no more worries...