or best offer:This 9" Widescreen LCD with built-in DIGITAL wireless receiver, is a quad-view monitor. You can select single, dual or QUAD camera viewpoints. 9” monitor includes secure microSD Card slot which will allow you to record all video that is displayed on the monitor. System includes a remote control. Can use up to a 128GB microSD card (NOT INCLUDED)

Premium WIRELESS 2-4 Camera DVR System for Truck Drivers & Fleets

Record 2-4 Viewpoints with Wireless Heavy-Duty Bracket Cams

Night Vision camera recordings with 20 built in infrared lights

Wireless 9” LCD with Quad View Capable Screen (1-4 Viewpoints at once)

Easy Do-it-Yourself Installation

Reduce Accidents by 70% or more with Blind Spot Monitoring

Digital wireless system comes standard with two wireless cameras. You can add a third or fourth camera any time, this will enable you to record and view 2-4 viewpoints. All recordings are time and date stamped for additional accuracy. 

This one of the best overall system for truckers, especially fleets. 

you can also watch on youtube a video wherr you see the quality of those cameras by complete darkness
it is really amazing.
i bought them used them for a couple trips but had accident.truck had to go to repair and boss took cameras off.since then they just lying around.those cameras working fine no damage on them.

Can't go lower than 700$.