It works by generating interference that masks not only the units in close proximity to the truck, but also obscures segments of the map to electronic equipment and enemy units in the area. Due to the need to make the unit portable the reductions in size and electrical consumption resulted in a much smaller radius of effect, but the demand to hide forces on the move was great enough to make it worthwhile.
The mobile gap generator was decommissioned by the first iteration of the Third World War.
The unit is essentially a gap generator on wheels, deploying gap effect continuously while on the move. When the unit mobilizes, the gap field follows its path accordingly. They are akin to the Nod mobile stealth generator from the later Firestorm. There are differences between the two as the mobile stealth generator needs to be deployed first before the stealth effect can take place while the gap generator is able to simply continuously transmit the gap field without the deployment requirement.