Most folks swear by the Tekonsha Prodigy. You can get them pretty cheaply now, they are tried and true, and work great. Not tough to install at all.
I have a Tekonsha Voyager, which is considered inferior to the Prodigy. Teh Voyager actually works fine, but it's a little harder to get dialed in just right than the Prodigy.
Get a Prodigy and you won't go wrong.
There are some that I think are better, but they cost a lot more. Hard to beat a Prodigy bang for the buck.
see ya on the road,