Anyone have any experience with trailer/hitch cameras from Swift Hitch? I'm thinking about getting their SH04 wifi camera to make hooking up to and backing up my trailer easier. They're pricey but look like a decent product. I really want something battery powered and completely wireless so that when I'm not using it I can put it away and not leave any potentially stealable things on the truck. I especially like the magnetic mount camera that I can put on the tailgate for hooking up to the trailer or move to the back of the trailer for backing the trailer into places.