A rare drop that makes it harder for people to take the workbenchs. Could be something simple and modular such as deadbolts that strap the workbench down to the foundation. As before, workbenches were not pickupable and perhaps with high quality deadbolts for example would make such as change permanent again at the benefit of making it harder for raiders to take the workbench.
(perhaps the deadbolts take a bit more expo ammo or etc)
Metal Deadbolt (4-8 springs 350 metal frags)
Highquality Deadbolt (4-8 springs 25-50 high quality)
1 deadbolt per corner of the workbench.