Just get it tested before you fully trust it. The back of cars are very hard to protect and trucks are even worse. I highly doubt even a three head ZR4 will protect the back of that truck very well. I have a quad LI and a ZR4 on my Ford Escape. The quad LI protects the front and back of that SUV just fine by itself. The ZR4s sit there and basically do nothing. I have them set for receive only, so they can tell me whether the laser hit was from the front or the back.
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