I have done both a trailer and a flat tow M1009 recovery. The flat tow was by far the easiest for the entire trip. However, 7 hours sure is a long way to go empty just to realize 3 of the wheel studs on the drivers side front tire are missing, the steering tie rod is bent, a rear rim is covered in gear oil, you forgot your back up 1" pin and the two you brought aren't in the bed of your truck anymore, you forgot your stick on lights, etc.. None of the above happened to me. I was just thinking of things that make your stomach feel like you just got punched when you figure them out.
If you have it, I would suggest a trailer. Just don't get 400 miles from home and have 2 trailer flats within 20 miles of each other after dark on a Saturday night in the middle of nowhere like I did bringing back my first M1009. Oh, a big enough jack to pick up the trailer with the M1009 on it would have really been nice that night too.