I know, I am the one who created the Jeep, which your model is based on (including errors

). However, you once stated the 3D Models originate from GTA 5. Nothing wrong with that, these can be obtained from various sources, including Google 3d Warehouse and Turbosquid, but the license details are not clear (at least to me). So I doubt that you're allowed to release these models under the GPL3. Apart from that it is a matter of fairness to name the source of your 3D Models. I found nothing in the readme or model files.
I don't want to discourage you from making cars and porting those models (I like the Camper). All of the above are formal things and can be easily fixed by changing the License.
Greetings