I designed this simple rolling monster truck since most of the vehicles I found uploaded already were either decorations (did not roll) or not modeled well (mismatch in sizes between axles/wheels, hard to print, etc).
The 3mf file includes 2 separate plates, one with 4 wheels and one with the 2 axles and main body. The main body is designed to be printed on it's side. It's recommended to use a brim and tree supports for the axles. Depending on your printer's tolerances, the filament you use, and whether brims are used or not, the fit of the axles in the wheels may vary. You will likely need to glue the axles into the wheels with super glue or similar.