Based off a 1920's Bugatti or Mercedes' race car, this would have to be my favourite model, at the time of uploading.

The body can either be printed whole, or in 3 sections for a cleaner print, both complete with holes for simple 3D-printed journal-bearing-style sleeves to support the axles, allowing for a much smoother roll.

Now, I did print the tires in TPU, but it shouldn't affect the print if you can't or would rather not.

I've added some images that somewhat show the assembly process.

Made in Blender