Although the glide awnings so popularized by motorhomes appear to make sense, NuWa is not in total agreement they are the best investment for customers. The supposed benefits are they keep debris and moisture off the top of the glide room, so it stays cleaner and doesn't allow rainwater to stand on the glide room top when it is retracted.
But there are also downsides we have noticed. Tension is such that these awnings can actually "pull" the top of the glide box inward, which breaks the seal and can allow leakage. Over time the tension can "fade", which can allow the awning to "billow". Many customers complain of difficulty sleeping, because of the awning "flapping" on a windy night.
NuWa's position is that if a glide room is designed and built properly, it will clean most of the water and light debris from the roof as the glide is retracted. By using the rear luggage ladder or a step ladder, one can easily "broom" the top of a glide before retracting it, if felt to be needed.
Bottom line, NuWa does not promote glide awnings, nor are they a listed option for our trailers. We see customers who are frustrated with glide topper awnings and we hear from customers who praise them.
A new version by Carefree called "Summit" may resolve some of the issues mentioned above by having a "peak" in the awning surface to promote water and debris runoff and maintain tension.
This question is also available for viewing online at http://www.nuwa.com/faqs/questions/20/