I think it was just a misunderstanding of the words I or you used.
I stated Class C does not apply to this discussion because it deals with haz mat and passengers.
Let me put it this way......
You would only need a class C if you hauled haz mat or passengers. Class C is not the only license that allows you to haul haz mat or passengers but if you have a class C you do one of the above.
A class C does not allow you to drive trucks over 26,001 lbs. If you did you would need a Class A or B.
If you drive a truck smaller than 26,001 lbs you do not need a CDL unless you haul haz mat or passengers. This is where the commercial class C comes in.
So like I said before a class C is N/A to this discussion on trailer size. If you do not haul haz mat or passengers you have no need to get a commercial class C license.