$ 170 Plus shipping.. as long as you don't lose one they might be great.. We do a lot of towing here, I imagine everyone will be using wireless soon if these work good.
Nothing personal, but $170 for this?
You can buy a whole lot of pigtails and hook up wire with $170 and have enough left over to take Mama out for a good meal to boot. If you are towing, you ought to be rigged up to do it anyway.
Here is a question: "What do you do when some bored crack head lifts them off the roof of your toad and walks on down the street with 'em?"
Wire it up and keep the change.