When we went to Florida, we were taking stuff to my grandparents. Had a U-Haul. International truck with a IDI/Na 7. 3 and 5spd. Truck was fairly light and had no problems overall. It rolled over to 200k on the way down. Biggest PITA was that it was geared low, had trouble getting ito 4th. To do 65 you had to sit on the governor. Did have air-ride so that was nice. Took 24hrs. to go down. Had rental car (PT Cruiser) on the way back, did it in 19.
Saw 4 U-Hauls on the shoulder and one Ryder on that trip.