At that price you get what you pay for. For a good quality camera with IR that is capable of near dark and good resolution you will be looking to spend around $200-300.00 for just the camera, and I will have to disagree with SD (who I tend to agree with, for the most part
) you do not need to go with security cameras, there are very good application specific models available and you do want it mounted at the license plate for a number of reasons, especially on a truck (or any other vehicle with a hitch, even saw a Vette with a hitch before
) where it allows you to hook up to a trailer without a guide.
On Edit: My friendly jab at SD comes with a caveat, at that level of camera you are most likely getting the same "guts" as a security camera packaged for backup camera use.