It would be extremely helpful if we knew the framing of the slider where the brackets are placed. I hate to just assume there is some type of solid structural piece running along the top of the slider, but I would think there would have to be. That appears where the brackets are attached. I saw a thread where another person had posted how he had installed his. I'll see if I can find that again and reread it. I just gotta think it can be done fairly easily and safely by a DIY'er.
Edit: I did find this post that is helpful and shows it can be done.
Brent,
Yes, I personally installed slideout toppers on my 2015 303RLS. I installed Carefree of Colorado SOKIII covers with built-in deflector, but not having the metal cover. I ordered the SOKIII's from: RVandAutomotiveParts.com . The ones I installed are white (my choice). Part numbers etc are as follows:
Bedroom Slideout: UQ0770025 (canopy length: 83.5"; Rollbar Cut Length: 83.25"; Summit Deflector Lgt: 83.38")
Dining Area Slideout: UQ1330025 (canopy length: 139.5"; Rollbar Cut Length: 139.25"; Summit Deflector Lgt: 139.38")
Kitchen Slideout: UQ1490025 (canopy length: 155.5"; Rollbar Cut Length: 155.25"; Summit Deflector Lgt: 155.38")
*** The Kitchen Slideout requires the Carefree of Colorado "Hidden Deflector Mounting Bracket" (2 required, I used 3 and am glad). Brackets sold directly from Carefree of Colorado for $21.01 ea plus $10.00 freight. These brackets make it possible to mount the cover at/on the bottom edge of the room flange. This is necessary due to the location of the refrig top vent.
The installation is fairly simple if you are DIY competent. Use a level for layout liines, pre-drill pilot holes for self-tapping screws, use silicone in holes and with brackets, etc. Measure twice and drill once !!
The covers with vinyl installed have significant weight; however, paying attention to the wrap direction, removing the vinyl from the tube prior to setting the tube on the mounting brackets, then taking the vinyl onto the roof of the RV and feeding it back onto the tube makes this a one-person installation. Just don't fall off the RV !!!
Actually I wish that I had installed the one on the kitchen slideout first because that is when I was informed by Carefree of Colorado about the hidden brackets. If I had known about them I would have used them on all three covers even though that does add to the cost. They make a cleaner installation IMO.
Hope this helps. If you need any information about this install just let me know.
Rich Kaiser