My wife and I are owner/operator team for past 5 years. We don't make as much as you but enjoy what we do. We only run about 125000 miles per year. Our profit is about 1.13 per mile. Expenses about 1.22 per mile on a 10 month avg. We have a big sleeper with 2 trailers. One is flat and other is a van. I don't want to run a lot of miles. This might give you a glimpse of what we do with a truck and trailer payment. Our profit will improve once we get equipment paid for.