General Nonscientific Rule With Plenty Of Exceptions #1: If the vehicle in question looks like it can provide decent protection from infantry-grade weapons, it's more likely to be mechanized instead of motorized. (Remember, mechinf take half damage from other infantry for this reason, but double damage from big guns because those are more likely to kill an entire vee in one hit.)
General Nonscientific Rule With Plenty Of Exceptions #2: If the vehicle in question looks like it does not use wheels(or in some cases tracks), it's much more likely to be mechanized instead of motorized. (Note that aside from looser terrain restrictions due to their small size, motor movement behaves a lot like wheeled movement. They certainly don't hover or fly.)
General Nonscientific Rule With Plenty Of Exceptions #3: If the vehicle in question looks like it can fit through the front door of a TARDIS(a.k.a., almost any cargo carrying combat vee in Battletech), it's more likely to be motorized instead of mechanized. (Motor troops can be carried by any transport with enough space, while even very small mechanized units require big units such as Large Support Vees or orbital shuttles.)
