the units were not all installed correctly. finally after waiting, we fixed all but one ourselves. still waiting on the part for the broken unit. this has been several months. my contact no longer answers my calls. i am about to change companies. my truck is not in compliance. i spoke to the CS manager and my rep back in jan 2018. they were going to send a part and a rep. it is mid march and nothing. I can no longer get them on the phone and I have been interviewing other companies. I spent a lot of time and money and spoke to several companies. These folks will promise the world but will deliver nothing. beware when doing business with them