"the biggest failures i see from true 3/4 and 1 ton work trucks are 90% lack of maintenace."
That has not been my experience. I am extremely disciplined about scheduled and preventative maintenance, and I invariably perform and maintain at a level that most folks would consider as overkill.
New 81 Chevy K-15; 2 new A/C compressors, 2 complete valve/head overhauls due to bend valve rods. All in less than 57,000 miles
New 88 Ford T-Bird: new transmission x 2; new rotors x2 (cracking), 3 A/C compressors, long block replacement due to main bearing issues. 67,000 miles
New 90 Ford Aerostar: 1 A/C compressor and 2 new transmissions. All in less than 30,000 miles.
New 96 Ford F250: 2 A/C compressors; Complete ring job. All in less than 36,000 miles
New 2001 F350 7.5L Turbodiesel: 2 complete transmissions; the first at 1500 miles, the second at 25,000.
New 2003 F350 6L Turbodiesel: 2 New transmissions; the first at 500 miles, the second at 1500 miles; also complete replacement of the fuel supply lines. (leaking)
All of these vehicle were garaged and not abused in any fashion. That has been my experience, and why I am now looking elswhere.