will a 35x13.50x20 fit on a.....
#4
With somewhat small amounts of sideall on a 35/20 combo the bolloning effect of a 13.50 on a 12.5 might cause some wear issues. I know it seems like 1" isn't a huge difference, but it might be just enough to not get the wear or drivability out of the tires as you have hopped. Not saying it won't work but it isn't the most perfect situation.
#5
#7