I don't know if this is what you're looking for but I have a 6' fleetside bed off of my 83 K10. It has no tailgate, rotted through side fenders over the arch and rotted through rear under-the-floor support brace. The floor itself is solid with no holes as is the rear vertical support towers and wheel houses. I need the front header panel off of it so it is by no means complete. I never threw cement blocks at it and the floor is really straight (private-use sport truck kind of thing back in the day). Let me know if you want some pics.