What did you do for chassis stiffening?

Sub-frame connectors in 2"x3"x .120" wall . Bought a length (25') for $35.00 , had them cut it in half so I could get it home . TIG welded in . I also had a 6 point rollbar installed . chrome moly with swing out door bars . I did this after my best friend rolled his Coronet over 4 times , hit the barrier and caught fire . The roll bar was installed a month before the wreck . Every panel was destroyed but he walked away . Enough said .