Dumb Qwestion????

What does class 8's or bigger mean?

This will basically answer your question;
http://www.goodyeartrucktires.com/pdf/r ... _S15_V.pdf

Since your truck is an L series in reality any questions should stay in the L,R,S section. IMO the size makes no difference,an L is an L same as a K is a K. It makes no sense to use two sections,keeping everything in one makes it easier to find.
I've become blue in the face trying get the title of this section changed to something like "Other" models.