I've personally owned 3 trucks, each of them having ~200,000 miles when I sold them and bought a new one. All have been gassers, and none of them ever had any engine or transmission problems. I maintained a CDL for 30 years before I retired and I have driven many different diesels and hauled thousands of tons of material and equipment with those. If I were going to be towing a lot on a regular basis, I would also get a diesel, but I wouldn't want the maintenance to deal with which was a common issue when I was working. Fortunately, those diesels belonged to my employer and I wasn't responsible for anything breaking.