Easiest thing is get one that sticks on the dash or windshield. Just plug it in to a power port. Those things we used to call cigarette lighters.
Look for 1080p recording, at least 120 degree lens. Try to find reviews with sample footage. Some just aren’t very clear. You can actually get a fair unit for $20.
In the rear the easiest is probably to just buy the same unit and stick it in the back window. If you want to see the image when driving it’s either a lot of wiring or it gets expensive with wifi/bluetooth. Then you need a display or smart phone.
Thanks. Don’t have WiFi in the truck. Bluetooth, but hooked to my phone.
Good suggestions. Thank you.