serial.write output GPS sentence formation and concatenation

Since you seem to think that you get a line feed added to the output of the Veh_ID string, why don't you shit-can all the code that gets data from the GPS and PROVE that the line-feed is being mysteriously added.

const char Veh_ID[] = "joe@joescar:";

void setup()
{
   Serial.begin(9600);  //Turn on the Serial Monitor (Actually that is NOT what that statement does)
   Serial.print("Veh_ID: [");
   Serial.print(Veh_ID);
   Serial.print("]");
}

void loop()
{
}

If you get

Veh_ID: [joe@joescar:]

the linefeed is coming from the way you manage the GPS data.

If you get

Veh_ID: [joe@joescar:
]

the problem is with whatever you are sending the data to.

Which problem are we trying to solve?