I have a 2003 Keystone 26 ft. I was towing with a 2004 Nissan Titan that pulled it like it wasn't there. Foolishly I bought a 2005 F-150 with the tow package. Although it says it will tow 9500 lbs, it feels very sluggish when starting out compapered to the Nissan. The engine is a 5.4 compared to the 5.6 I had. The truck also seems to feel as if the trailer brakes are on just a little trying to hold it back, although the brake controller says no. Could I have too much pressure on the equalizing bars on the hitch? Any other thoughts, tests etc appricated.