i have a 03 E 350 totally stock supervan with a V 10 engine pulling a 7300 lb trailer, fully loaded my tow vehicle and trailer weigh 14,300lbs. Ford says I can pull up to 15,000 lbs. The V 10 gets a little slow going up steep hills, I thought the V 10 had more a-- than that for towing. any comments or ideas would be appreceated. thanks ma speling aint to gud either