It is not expensive "rocket science", Barton. Here is a link to CW that will illustrate a variety of brake controllers:
www.campingworld.com/browse/categories/index.cfm/Outdoo...5:catID=338:src=brsq
Your Beaver may have a wire harness under the dashboard to connect the controller, if the Beaver is "factory-equipped" with a tow package. Beaver can tell you, or you can pay to have a mechanic install the controller and the necessary wiring. Can't give you an estimate on that cost, sorry.