There are things you can do to decelerate or accelerate the corrosion. We used to always get pissed when we would sell a $30-40,000 heat exchanger with stainless tanks that would start to rust when some idiot cleans it with steel wool. It doesn't take to much extra iron to make the nickel overwhelmed. Sad stuff.As my metal supplier told me once "THERE IS NO SUCH THING AS STAINLESS STEEL! It's only stain resistant"I guess he was having a bad day that day.
I realize that the 7 was about 2x the price of the truck but damn! That thing is built like a tank compared to the Taco. It's quite, has balls, and is not made cheap by any stretch of the imagination. Too bad it is not a truck but that hasn't stopped me from taking down a good number of trails!!! I will never forget one time that we took a 4x4 trail and ran into some folks that thought we were nuts!!! We could not stop laughing. Other than dust and having to use caution and concentration to gain clearance, no damage was done... UNTIL we were fishing with the car on pavement. Out of nowhere a small branch (less than an inch in diameter) broke due to wind and put a dent in the center of the hood! 
. Yeah this was more like your 82. Luckily it's an easy fix.