I found a pretty new model of 12v Monitor which I think is perfect for an in-van TV : r/vandwellers
Amazon.com: Vehicle Backup Cameras Monitor System 12V/24V,4 x HD 1080P Front Side Rear View Camera + 7" inch Quad Split 4CH Car LCD IPS Monitor for RV Bus Truck Trailer Caravan Camper :
Tolató kamerához monitor 12V 4,3 col - Convoy Truck Shop
Car Monitor With Av/aviation Input 12v 24v High Resolution Tft Lcd Display With Touch Button For Backup Reversing Aid For Bus Truck Rv, Trailer - Temu
24 Inch Lowest Price Good Quality 12V 5V Monitor Made in Malaysia Japan Panel - China 19 Inch PC Malaysia and AC/DC Monitor price | Made-in-China.com
Buy Wholesale China Hot 20-inch 12v Led Computer Monitor & 12v Led Computer Monitor at USD 58 | Global Sources
Akron Forestry Monitor Pkg 12V Monitor, Low Flow Noz, 2" Elec | NAFECO
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Amazon.com: IPCamPower POE Powered CCTV HDMI Monitor 21.5" 1080p, 12V DC Power Output, Built-in Speakers, Designed for 24/7 Operation : Electronics
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12V LCD Monitor AC Power Adapter with 4-Pin Connector
11.6" Portable Display 11.6 inch 1920x1080 60HZ Full HD 1080p IPS LCD Monitor with HDMI / VGA / USB / RCA / 3.5mm Audio Ports, 12V 2A DC Power Supply, High Definition Video Display. - Newegg.com
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CamView Elite Portable Video Test Monitor for Security Cameras with 12 — Triplett Test Equipment & Tools
12V AC power adapter for GVision L5PX POS Monitor - FindPowerCord.com
10 Inch 12V DC TFT LCD Multi Plug Monitor HDMI VGA BNC RCA USB 1024x768 HD for Car Tuck PC Computer Home CCTV Security Camera - AliExpress
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In Command 12v Monitor Panel NCSP3DCCT - Affordable RVing
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Source DC power supply 12V 27 inch tft lcd 4k monitor gaming on m.alibaba.com
