Heard that modern truck engine compartments are getting so cramped you gotta lift the cab to even change all the spark plugs. This way dealers can charge $500-$800 for a plug change. (And diesels, which don't have plugs, have even more stuff ($$$) crammed in instead.) It's getting to the point where having the know-how plus equipment to lift a cab is becoming outright essential if you don't want to pay thousands for routine maintenance.