I'd say 23.1s and 28Ls on the back probably accounted for 60% or so of the 88's and a good many of the 7720's around here.    I had 23.1s on my 7720 at the end, ran 18.4s and 24L's earlier.

We run 67-34-25 Custom Flow Grips on the back of the 9600 when it's muddy.  One of the neighbors put their 66-43-25's from their 6600 on the back of theirs this summer cutting wheat.