Assistance for sorta' newbie with web hook

Long-term user of HomeSeer and experienced Python - but total newbie for HA and jinja is still pretty Greek. I’ve successfully captured a web hook from a GPS tracker. The JSON output is:

    {
      "EventType": "gps_report",
      "GPS_Report": {
        "ReportID": "Xvfq6nsB8mdQyQS2s92Z",
        "Accuracy": 20,
        "CreateTime": "2021-08-27T23:20:50Z",
        "DeviceID": 49841,
        "DeviceState": "NotMoving_NotCharging",
        "HDOP": 4.15,
        "Heading": 107,
        "Latitude": 26.95457,
        "Longitude": -81.89468,
        "PositionSource": "gps",
        "ReceivedTime": "2021-08-27T23:21:50Z",
        "ReportingFrequency": "1d|10m Premium",
        "ReportReason": "MovementChange",
        "RSSI": -75,
        "Speed": 107,
        "Temperature": 22,
        "Voltage": 4.15,
        "VoltagePercent": 98
      },
      "Mode": "live"
    }

If I display {{ trigger.json.GPS_Report.DeviceID }} I get the 5 digit string I expect. What I need to do is translate the 5 digit code to a vehicle name (text). However, if I execute

    {% set vehicle_id = {'Jeep':'12345', 'Volvo':'23456', 'Trailer':'34567'} %} 
    {% for v, i in vehicle_id.items() %}
    {% if i == trigger.json.GPS_Report.DeviceID %}
    Vehicle = {{ v }}
    {% endif %}
    {% endfor %}

I get the null string. If I put double braces around the json element {{ trigger.json.GPS_Report.DeviceID }} I get the error

Message malformed: template value should be a string for dictionary value @ data['action'][2]['data']

Assistance would be appreciated. If there is an easier way, that guidance would be appreciated as well. TIA