Slightly Less Tougher than Nails...
The quest is unlocked after completing the Testing... Testing... One, Two... quest.
"Terrako was so excited about its upgraded chassis that it leaped from atop a tower, nearly smashing to bits in the process. It seems you need to strengthen its armor somehow."
"With the armor upgrades complete, Terrako took yet another ill-advised plunge off the tower. Thankfully, with shock-proof cushioning installed, it came away with not even a scratch!"