The swami bar does not fit a Tmaxx, is no stronger than any other T6 6061 aluminum bar and will bend in short time if you bash with it.
Even T6 7075 aluminum which is approx 2X the strength of 6061 will bend/break when used as a bar type wheelie bar on a Tmaxx.
A rear wing is a better option than the flat bar type wheelie bars to prevent the truck from flipping backwards on its lid.