My 08 Dodge diesel has 4 doors and a long bed. It's 23' long. It sits fairly level stock but when I put a stock rack with critters on it and hang my camp trailer behind it, it does squat a bit. I also have air bags that nicely bring it up to wherever I want it, adding some good weight capacity.
If you raise the front to level one, a set of air bags will take care of that squatting problem when you load it.
