Gino, when I received the M123 two-winch tractor from Hobby Link last year, I noted that the tires were almost rectangular in shoulder profile, rather than the more rounded profile on 1:1 scale items. I spent a couple of hours with a coarse sanding stick, rounding them off, but the outcome was a set of tires that more accurately represented the typical cargo truck tire.
I communicated with the Hobby Link owner, sharing my experience, which I added photos, before and after, to, He replied that he would look into revisiting the tires at the production end.
I have some photos somewhere “in the cloud” showing before and after. Somewhere…
Oh heck, just look in the thread above for my truck’s images. Forgot I placed them there earlier…