I have owned my Super Duty for just over 2 years now and the only problem that I have had with it is when pulling a heavy load uphill and standing on the accelerator the surpentine chirps a little. It will pass anything but a gas station! :laugh:
We pull a Cardinal 33RLWB. Probably about 11,000 loaded. Use a F-350 V-10, 3.73 gears and have had no problem. I have even pulled up 6 and 7% grades. Mileage isn't great. I get (towing with AC running) around 9.2 if everything is good. PLulled into a head wind this summer going up in New Mexico and got 7.25 on the worse tank. I've put in a chip and get close to 15 when not towing on the highway.