Hello, new member here. I have a new-to-me 2013 Suburban 1500 LT. It does not have a backup camera and does not have a dash screen, but that was an option for this truck. Are the power & video wires already present in a harness running to the tailgate? If not, are there any unused wires running from the dash to the tailgate? If so, I will go hardwired. If not, I'll go wifi. Thank you in advance.