You took the words right out of my mouth. A class 7 truck has been proven to be trustworthy and dependable for many drivers if taken care of with a good, well followed preventative maintenance program.
Again not every class 7. Our truck was properly maintained from new. (We have all receipts) we were the 2nd owners. Pm preformed every 12k. I look over my truck everyday and watch for things to go bad. But maintenance won't stop the problems we had. It had nothing to do with maintenance. Drive train was solid. But everything else was breaking. A/c compressor 4 times, alternator, 5 windshields, radiator, hvac problems, wires going bad, water pump, apu motor due to a computer malfunction causing it to over heat, apu computers, roof a/c we did have to do a head gasket. I know I am forgetting stuff but we had $50k in repairs $20k of that over the last year. The cost isn't the problem. The down time caused by bad shops and having to order parts because the don't stock our parts. Getting wrong parts etc. That is what was the killer. We could never get ahead of the repairs...