There were a couple guys running 37s with a 6 inch, with it cranked a bit. There is one guy on here running 39.5s with his 6 inch cranked all the way up... After making my 35s fit on with it cranked up, I am sure I could fit 37s with a 6 inch...
It may be different by brands of tire too though because of the metrics not always working out the same. 315s range from 33.5-35 depending on brand... And on wheels too.
I had a hard time finding the BFG's when I was tire shopping. They were on a pretty good backorder. I ended up getting the Toyo's for a little bit more. The Toyo's are an inch wider and an inch taller (weird, i know, but it's true), so it might require more trimming. But, go for it! The 37's look awesome on a 6"+crank.
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