I pull a 5100lb (dry) 7800lb (gvwr) trailer. I have a 2004 F150 FX4 with a 5.4l V8, 3.73 gears and an Edge Evolution programmer. I can pull the trailer OK right now, I wont be winning any races mind you, but I want a bigger beefier looking tire. I presently have 275/65 R18 Copper Discoverer STT's on the truck. I want to go to 33X12.50 R17 Cooper Discoverer ST's. I want to know what you guys think about that. The tire itself is only about 3/4 of an inch bigger but I need to know will I notice a difference towing and will I notice a loss of power to the larger wider tires? If you have these tires on your truck let me see a couple of pics. I do a little offroading with the truck and have actually owned these tires before on a Dodge 1500 (I know, I know. Recently converted to Ford) and know they are an awesome tire. Let me know what you think. Will there be any noticeable difference in performance.

Thanks in advance guys.