I know people who buy their lease car all the time. Sometimes cause they have grown attached to it. Other times cause they can buy it for less than market and then turn around and sell it.
Be aware that it is only a good idea if your particular vehicle is of a desirable color and trim level AND it is in immaculate condition.
From the pictures I have seen of your boats, you should have no trouble convincing a buyer that you have maintained it well.
Anytime you gotta advertise, show, and try to market your own vehicle, it is a hassle. It can work out well, though at times.
If you can buy your truck for NADA trade-in value, then you can make a buck on it. If you must pay near retail, let her go.