I am getting an A-frame pop up camper with electric brakes, single axle. Looking for thoughts/recommendations between the Tekonsha Prodigy P3 and Tekonsha Prodigy P2. Brake controllers. I know they both get good reviews, but wonder which works best with the Frontier? Specifically which is easier to mount, and easiest to use. I won't be towing multiple trailers or switching it back and forth between different vehicles.