Simplest self install dinghy brake system for a DP?

If you're talking about hooking up the toad to the RV, I'd have to vote for the Invisibrake. That's what I use and all hookup consists of is plugging in the umbilical cable from the RV to the toad, then clip on the breakaway cable. Install is a little more involved, but there's is no set up at all and it stays in place, completely hidden under the front seat.