RearViewSafety has both wired and wireless units.. I doubt you will find any that will hook to your GPS as it will probably be proprietary. After going through several wireless units I bought a hardwired unit from RVS and have been very happy with it. Sure the install takes a little longer but the no interference is GREAT..
after thought.. call RVS, toll free, they might know the frequency of your GPS and have a cam that will work with it.. worth the call if you really want wireless.
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