Truck / Trailer question?

I have a '97 Ram 1500 4x4 witht 5.9L engine and auto tranny. I tow a 900 pound trailer and a 3100 pound race car. No problems at all, most of the time I don't even know the trailer is back there. I've already had the tranny replaced once, though.

My neighbor has a 2000 Dakota 2x4, V6, auto tranny. His trailer weighs around 1200 pounds, his car is around 3000 pounds. He tows that no problems as well. It has no pickup with the trailer on it, though.