yes weeds MT are popular for the tug but this is a new trailer?
...and your point is??
GeoffA are you going to pull a wheel off the trailer to put on your tug?
....if I need to....
the spares can be to suit both but a tyre like that on a trailer does not make sense to me?
So that's your opinion. As stated earlier, some like interchangability.
Others might like to fit new tyres to the car, and make use of the tyres from the car on the trailer.