Another vote for the Roll-n-Lock. Easy install and works great.
Vinyl covered aluminum slats will carry a couple hundred pounds. Pry proof and knife proof (well, the aluminum is)
Canister is only 8-10 inches deep. Auto stops/locks in four positions and can be driven with cover in any of those positions. Doesn't block rear view mirror while open.
You tube video shows how to add a stop position anywhere you want. This guy did it just in front of his 5th wheel hitch so the area in front was still covered while towing.
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GMC Sierra 2500HD Duramax
2022 Cougar Half Ton 24RDS
Solarflex 400i + 150w suitcase; 206ah LiFePO4; ready for boondocking