Identifying trucks
 

I just picked up a chassi of another cmp, giving me 3 now. I know one is a F15 but not sure on the other two. No data plates on them at all. One has a winch and has 20 springs on the back and 13 on the front. The new chassi has a newer flathead in it, 11:00x20 tires on it. 18 springs in the back and 13 in the front. Not sure if they would be F30 or F60. Would like to know what I have for sure, help would be appreciated. Will post pictures of the new one soon as I can.

Thank you

Eric