Old vs New

I just recently sold my 2002 Ford F-350 dual rear wheel 7.3 diesel with the about 123,000 miles on it. I have made a few modifications, treated it like one of my own. I would not and did not hesitate to hook up my 10000 lb travel trailer and haul it around the country. So if I were you I would take into consideration the cost of the mechanical maintenance versus a few months new truck payments. I would discount the Cosmetic work as that is a bit like elective surgery. I don't know anything about the V10, I've had several Ford's but never that engine. And so I have no idea what it's life is. You don't mention how many miles you have on it, but if you think it's good for a few more big trips oh, what the heck. There are lots of trucks and cars to be purchased whenever
and as soon as you buy one, they will come out with the bigger and brighter and shinier one. But as you say, ultimately it is your decision. Whatever, be safe and enjoy your trips.