I know a trick that can describe the vehicle type, LaventilleLogistics.
Right now, modifying the vehicle type isn't an option. You can only choose Car from the drop-down.
You may use the Vehicle make and model field to describe the vehicle you're using. Here's a sample screenshot as a visual reference.

Adding the correct truck information will help you match trips to the right vehicle. You can send feedback about being able to choose different car types to our Product Team. That way, they'll add this request to the list and help improve your mileage tracking experience.
You can send feedback within the QuickBooks Online company file. Here's how:
- Select the Gear icon at the top, then Feedback.

- Enter your comments or product suggestions.

- Click Next to submit feedback.
- You can track feature requests through the QuickBooks Online Feature Requests website.
To ensure your recording business miles, please follow and don't miss any of the steps outlined in this article: Automatically track mileage in QuickBooks Online.
You're still welcome to comment back if you have more tracking-mileage questions in mind or need anything. I'll circle back or other Community agents are still around to help you.