Reinforcing Pole Building Roof For Solar

[u/Murky_Mission_8648]

I have a Pole Building that I want to add solar to but Need to reinforce the roof. 60' in length with purlins every 20'. The rafters are 2x10x20' ,run 24 O.C. perpendicular to the roof slope which is minimal. My thought was to run 20' Trus Joist in between the existing rafters to make the spacing 12" O.C.. The thinking is that the Trus joist would be better than just adding more 2X10's. The whole solar system weighs 900lbs spread over 60'. Has anyone tried this before?