Uni-Strut loading guide?

Due to a very outdated regulation on the prefab house, I can't mount anything high voltage to it per fire hazard regulations

Is there a simple way to decipher uni-strut loading tables for 150lbs of inverter?

Imagine, a 4x4 post upright, two spans of uni mounted top and 3/4's of the way down to make holes/meet the inverter's mounting hooks

Is this crazy or is there something better?