You would need an 8.1 ft bed to fit a sheet of plywood. Most trucks don't have that. Plywood isn't usually laid flat in a closed bed for that reason.
It's either:
1. Hoisted onto a roof rack (I do not recommend this but I've seen people do it)
2. Lays flat with the tail gate open and overhangs the bed. Secured by ratchet straps.
3. Lays on top of the tail gate and overhangs it a bit. Also secured by ratchet straps.
I guess my point is that plywood isn't an issue for mid-size trucks anymore than it is for full size trucks.
1. Hoisted onto a roof rack (I do not recommend this but I've seen people do it)
2. Lays flat with the tail gate open and overhangs the bed. Secured by ratchet straps.
3. Lays on top of the tail gate and overhangs it a bit. Also secured by ratchet straps.
I guess my point is that plywood isn't an issue for mid-size trucks anymore than it is for full size trucks.
Heck, one of the selling points of the cybertruck is that you will be able to lay a full sheet of plywood with the tailgate up. It's only a selling point because it's an uncommon feature: https://www.reddit.com/r/teslamotors/comments/e60oxq/tesla_c...