Frame Rail Sectional Dimensions

[claudebo]

There are some really good posts on here.
I'm not sure if the failures are due to fatigue or bending failure.
It sounds more like fatigue. I do think the frames are probably A36
steel, most cost economical to manufacturer.

The solution regardless of the cause is to beef up the frame. I think the patch
from airstream is minimal and at a cost of $250 for $35 worth of steel. I thought Toyota was bad.