Yes, I'm adding a brace tonight. About midspan on the wrap around, up at a 45 degree angle to a plate next to the tailpan. That plate is bolted to the floor plate for the rollbar. The rollbar plate overlaps the tailpan by half (two bolts through the tailpan and two through the floor)
Technically this isn't the correct thing to do because I don't plan on a body bushing in there from underneath...but I'm gonna try it anyways.
A hit from underneath should transfer the impact through the cage.
Rene