Adding this was a mistake, it makes these buildable defences almost useless.
Remove this and add the ability to drive over barbed wire, destroying it. Maybe also allow mediums and heavies to destroy AT guns by driving over them.
If not then extend the consistency to map assets that look exactly the same as the buildable defences. And while we are at it, make the collision consistent too.
Atm you can drive through some barbed wire, but not through others, this is also not consistent within the map assets/props. (some have collision, some don't)