http://www.beachaudio.com/product_info.php?products_id=56604&prodid=hchrs&GC ID=C12585x003>KW=hchrs&utm_source=froogle&utm_me dium=cpc&utm_term=hchrs&utm_content=AD_ID&utm_camp aign=froogle
I got an audiovox ash-300 that works with a wireless sensor inside my H2. Set up in 5minutes. Just plug into the hitch (comes w/ lock), hitch receiver, and plug the sensor into the cig adapter. Works great and surprisingly accurate bumper to bumper. One issue was the spare tire mounted in the back and false readings. I had to add a hitch extension to bring it out some. Now it's flawless and nothing drilled. Can move it later to another vehicle, etc.