Dual system hook up how to help

[bigblockchevy13]

I'm new to the audio world but have a good understanding of it. I'm planning a build for my truck and I want to have 2 sets of speakers and sub. One set of speakers and sub in the cab and another set of speakers and sub for exterior sound using one head unit. I would love to be able to fade between the 2 but not necessary but I will need to be able to switch the exterior sepeakers off and on. I have a Kenwood KDC-BT858U head unit. It has front, rear, and sub RCAs. I want full sound quality to both. Anybody know how I can achieve this? Is it possible?

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[dev199505]

Y-splitters on RCAs and Toggle switch on remote wire for external speaker amp. Or use the passthrus on your main amps

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[bigblockchevy13]

Could I only use 1 set of rcas instead of all 3 that are on the back of my head unit to run my amps so I could use a fader for both sets of speakers?