Appreciate your follow on comments bartamos. In your travels have you heard of condensation being the primary culprit attacking the front inner and brow structures in these TF cabs. Just not sold on the fact these hidden areas could potentially have created its own atmosphere...these trucks weren't built that tight. You mentioned leaking drip rail, holes in outer roof skin, I don't immediately show signs of that going on here. The other quite probable issue was the poor metal prep treatments if any at all in 1959. I be willing to wager that voided area was just ignored and sent down the line. Shoot they weren't suppose to last 50 years...right.
