37" Tires...what rims?
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I can't think of any 37"s for 16" rims off-hand. That doesnt mean they arent made, but I had to do 17" tires when I went to 37"s. Also, I wouldn't go 16x12 even if they do make that tire size. They will stick out too much and will be just as unsafe as running on a wheel that is too narrow. I have my 37"s on 17x8 rims and they are just fine, I wouldn't go any narrower, but 10" is the widest wheel I'd go with.