Looking for a wireless back up camera

It is not uncommon when we camp close to home that I take the camper out myself and set up and then later on the wife and kids show up. As always the first thing I do is be very mindful of my surroundings. Looking at the site very well when I first get there to be sure it is ok to back into. I check for the usual - low limbs - kids playing - anything left behind from previous campers - you know just the basic things you should be looking out for. So I get back into the truck and start to back my unit into place and then I get that feeling that maybe I overlooked something. So I get out about halfway through the process just to be sure all is ok. I was just thinking if I had a wireless camera I could set on the bumper this would help ease my mind of what's going on behind me. Looking for something inexpensive but good quality. Anyone else tried this. Thanks for any info.:):@