OK, I know this was a prank pulled on the OP by his coworkers, but I have seen plenty of guys driving Jeeps without shirts and it wasn't a big deal. Of course, this was back in my younger days and they were driving CJs and it was near a beach, so shirtless was not a big deal.
Personally, I wouldn't, for a couple of reasons...
Ancestors from the the British Isles and northern Europe, so I don't tan, I just burn. I have that whole pasty white thing down pat.
Scar tissue from misadventures of my younger days -- about 5 ft total.
You might *think* you're still young and you ignore the muscle and joint pain from your younger endeavors, but when you realize that you rocking a lot of gray / white chest hair, you start feeling older.
Someone else in my household does!!! My Jeep girl!! We passed couple guys on the trail from Mammoth to June a couple weeks ago and they about drove off the side of trail, slowed and each of their head were looking back at us driving away!