Unless you can find a used one somewhere you're not going to get away cheap for load levelers and sway control. And I would definitely not tow a trailer that size without them. And, depending on your model that is pushing the limits of your Dakota.
See this:
http://www.new-cars.com/2004/dodge/d...er-towing.html
You can change the year but you can see the towing range varies considerably.