I went through this last year. Ngl, the CarbonPro bed is a total headache. I tried a standard setup on my Ultimate and it was a mess cuz the composite walls don't take normal clamps. Honestly, even with a BakFlip MX4 Hard Folding Truck Bed Cover, I still had corner leaks... super annoying. Quick tip: you MUST get the BakFlip CarbonPro Bed Mounting Kit or it'll never sit flush, right?

For ur situation, compare the Lomax Hard Folding Truck Bed Cover vs RetraxONE MX Retractable Truck Bed Cover. Lomax is cheaper and easier for CarbonPro - Retrax looks premium but costs way more. gl!

yo, congrats on the truck! seriously though, be careful with that CarbonPro bed. basically, standard clamps won't work on the composite walls, so you gotta get the specific mounting brackets or it’ll be a mess. - Folding: cheaper, better seal for rain, but blocks the glass.
- Retractable: looks high-end, better security, but takes up bed space. i'd go folding if you actually wanna keep things dry lol. gl!

Seconding the recommendation above about the brackets. honestly, the CarbonPro bed is a masterpiece until u try to mount stuff to it... it’s super annoying that standard gear doesn't just 'fit' right. i've been doing this for years and seen guys literally crack their composite walls by over-tightening the wrong clamps, which is basically a huge safety issue if the cover shifts at 70mph. tbh it's a mess. since ur looking for that premium feel on an Ultimate, u should probably check out the Pace Edwards Bedlocker Electric Retractable Truck Bed Cover. it’s hands down more secure than most folding options and handles the MultiPro tailgate clearance perfectly without any rubbing. if you'd rather stick to folding but want better weatherproofing than the ones mentioned earlier, the UnderCover Ultra Flex Hard Folding Truck Bed Cover is a solid bet. just whatever you do, dont skip the GMC CarbonPro Bed Tonneau Cover Adapter Kit... i learned that the hard way and it was a total mess. stay safe and gl with the build!