the wife and i finaaly got to put some good test miles on the f-1 last week. 600 miles, round trip, plus side trip to the red neck rumble. cruised 65-70 mph on i -24 toward nashville, got 22 miles per gallon, no problems. had a blast.
That is way cool. Your truck looks great. I bet that little tire on the trailer was warm after running 70. That is probably all it could take.