I have a Compustar alarm/starter. The reason they couldn't have my trunk pop from the remote is because my car didn't come from the factory with an actuator on the trunk. But for $100, they could install an actuator and then hook it up. So it can be done, just requires more hardware and time. So I just installed and wired up an actuator myself, presto, my trunk pops. This is assuming you meant to write trunk instead of truck.
And the extra LCD remote is about $110. That means don't break the one you have. If they didn't know the answers to these questions, I wouldn't trust them near my car.