I used a Tekonsha Prodigy for several years and was very happy with them, but on the last truck I bought a Tekonsha Primus as Stanton posted. It is self leveling, proportional, and comes with 2 different mounting brackets plus a wire in harness \, plus you can order a plug in adapter for many vehicles that plugs into a pigtail under the dash, or a plug on the fuse panel, if a place is provided. The Primus in addition to being self leveling is proportional, has a manual over ride control, and can be set for the amount of maximum braking to allow for different loads, though that will vary only a little with a camper. It also has a boost button with 3 different levels that if you are pulling a heavy trailer at higher speeds brings the trailer brakes in service faster than normal to aid in emergency stops, or turn it off for smoother stops at low speeds (push button on/off). the Primus will show the actual voltage being applied to the brake circuit anytime it is used, or if you do not have a trailer connected, or the brakes are not wired it will flash nC the first time you step on the brake. In addition it has a life time warranty. if your truck does not already have it, which I think a 2008 Ram 1500 does not, you will need a lead and a circuit breaker or fuse (20 amp I think, but not sure) from the battery to the controller and a 12 gauge wire from the controller to the trailer plug. Of course you will need to install the appropriate receptacle on the rear for your trailer. Make sure your truck is rated for the size trailer you are pulling, some of the "half ton" series are rated for as low a trailer weight as 3,500 pounds, while some go up to as high as 10,000 pounds.
This listing shows one that supposedly has the right plug in harness for your truck.http://www.amazon.com/TEKONSHA-PRODIGY- ... prodigy+p2