Wireless depends on the length of your rig.. I have a hardwired unit from RVS been on the back of the camper for at least 2 years now never even one seconds worth of problems from it... I put a second cam on the camper shell of my truck bed now hitching up is a breeze..
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12