Why use a six bar as the top for a DR4B?

What’s the reasoning for using a six bar for the top section? Is it for the extra height? Why don’t all teams use it then?

Its usually for extra height. On our DR4B we don’t use one but that’s just personal preference. It really just comes down to how high your team wants to go.

We use a 6 bar because it gives more space for the mobile goal mechanism.

We use it for extra height and the same reason that Brian uses it (Except in our case the situation is a bit more extreme)