Toppers are one of those accessories that some folks love and others have no use for.
I've helped others install their toppers and it's a hit and miss whether you find solid backing for all the screw holes. We always got them solidly mounted, but had to use alternate anchoring in a few holes.
I will never again have slide toppers on my RVs. Very noisy in the wind, and a storm deposits debris under the topper, then it's lots of fun to get it out. And when the sun rots the canvas like happens to awnings, then I have 4 or 5 to replace instead of one. We use our RV a lot in wooded areas and I rarely have to get on the roof to clean off slides. As far as pine needles and other debris tearing up seals, I have never experienced that. I will remove pine cones, but that's rare.
So take all the comments about toppers, good and bad, and the truth lies somewhere in the middle.
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder