Tom Clancy's Ghost Recon Wildlands

I got this during the first La Gringa Mission but any similar situation should work.

During the La Gringa mission I had escalated the fight to engaged and enemy reinforcements came in through the front gate of the mansion. After clearing them out I put a c4 charge down (note my blast radius is 3 skill points and VHC is max). Reinforcements were called again, sending another two cars towards the gate. As soon as the first car went past the c4 block and the second was close, I triggered the device. both cars destroyed and trophy popped.