Well they use to have something like this back in the early 70's.
When I was a kid we had a "slide in camper" for our pickup truck and my dad installed something like this so we could talk back and from from the cab to the camper while driving. I think mostly Mom like it because she could listen in to see if we were fighing. Surely somebody still makes something like this..... If not Im sure you could find a household intercom that you can make work.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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