^^this
I have had problems with both tack welds coming loose (thank you dealer service tech) on the front TRD skid. Those nuts are in the boxed in, lower frame support for the radiator. Had to have a fab shop cut out squares, weld in larger nuts (same size and pitch) and weld the squares back in to the frame support.
Sharing from my experience:
1) remove all skids before going in for any type of service. Although I leave the gas tank skid on and sometimes leave the A-arm skids if it's not going to get an alignment or other front suspension service.
2) Also, put bolts back in where they would otherwise be missing i.e the catalytic converter diagonal cross bar and the front, lower radiator supports. They are left hanging when the related area skids are removed as in my case for the RCI Transfer-front/Transmission-rear and the front TRD skid (ask me how I found that one out).
3) Use hand tools both ways (on and off).
4) Add some anti-seize to the bolts too when you put them back in.
5) Finally, knowing how weak the tack-welds are I don't over tighten the bolts either. Usually just enough with a final push on the wrench.
This won't address the nuts that are already broken free but hopefully won't break new ones.