I tow with a 2005 Pathfinder, 147K miles and counting.... Our current trailer is 5000lbs gross. We use an Equal-I-Zer hitch with built-in sway control and don't have any issues with sway or being pushed around, etc. You should be ok with the trailer you're considering. Keep OD off and on most roads, you'll be fine. In strong headwinds or through hills/mountains, you may need to drop to 3rd gear and let the engine rev at 3500rpms. You DON'T need to add an aftermarket trans cooler. The stock cooler is plenty sufficient. The fuel tank is relatively small, so expect to stop for gas every 120-150 miles depending on the mpg's you're getting (anywhere from 7-11mpg towing). Acceleration will be "ok" but take it easy and don't punch it too hard.