through triggers i dont think so. waht is this for even, maybe if there arnt that many units u can store the collision size in a variable for each unit. like collision[1] = 16 and in another trigger you can say something like unit = to 1. then in triggers u can use collision[value of units]. i dont know if there is even triggers like this but it seems to work in my head. who knows its getting late and this may sound like nonsence. | 
does anyone know if there is a trigger or JASS code that can find that collision size of a unit! help would be greatly appreciated.