We towed our Ranger home on a car trailer when we snap bought our 07. Went a crossed the scale at 5,500lbs on the trailer. Other than being a little slower going up hills, it didn't really care much. Lost 1 mpg due to the weight and yes, the V10 like to do 4K up hills. We are in the process of setting up the Ranger to be flat towed with the Harley in the bed. Ranger is a bit lighter than your Nissan though. Curb on ours is 3,200lbs they say. I will weigh everything after getting it outfitted though, so I know.