Slide topper recommendations

ive had both. In my experience, theres little reason for a slide awning unless the slide has a raised outboard lip that would make you sweep out leaves or snow to close it. Even then, debris will find a way to get under causing you cleaning issues and water infiltration concerns.
No reason if your slide does not have a raised lip as closing it will sweep off all the debris and snow.
Theres some $ pennies advantage for shade during cooling season, then theres the noise of it flapping on windy days or nights. Money poorly spent.
Its a looks great salesmans pitch. use your money better.
max. 42 years no longer a camp owner

Can't the manufacturer install the cover before you take possession? You could search this Forum for `slide topper' and read all the reasons for and against one.
IMHO if one has to get up on a ladder or the roof in order to clean off the slide before retracting that's reason enough to get a cover.

I installed Dometic on out 5er before we went full time, would not be without them. If it is windy just toss a tow strap over the larger ones. They greatly reduce heat transfer in sunny locations thru the slide ceilings.

First 2 trailers, we had Colorado slides installed and never had a mechanical issue.

Latest trailer has 2 slides without the toppers and can't say I miss them.

I'm liking the ease of access to the tops for cleaning and treating the seals with conditioner.

That said, we've never experienced sagging or flapping with slide toppers but did experience quite the dirt buildup on the underside of awning material which was quite difficult to keep clean.

I will probably hold off for a while. I have never had an issue with two previous trailers, and actually (after reading this forum I am almost embarrassed to admit this) never cleaned the top of either slide.

Thanks for the comments!