Truck follow-up question - Topper?

I bought a 2026 Sierra 6.5' bed 4x4 and want to find a weight bearing topper so I can load my raft frame, oars, etc. there.

I have no interest in roof tents and fanciness like molle, etc. Just a plain hard shell/fiberglass topper with a built in rack that preferably integrates with a roof rack on the truck cab itself.