Its very hard to get 37s for 15s these days as most tyre manufatures that used to make this size have stopped Good Year is one of them, 37s for 16s will only give you a few option, 37s for 17s and you will have heaps of options.

 

37x13.5/17's Toyo's here.....love them....they have a high load range, but if you dont run super high psi they aren't that bad for ride.....You will see allot of fullsize diesels running these for a reason....they hold up to allot of abuse and one of the longest lasting tires out there IMO...For our little JK's these tires will hold up.....

 

Just an idea, but there's two sizes to consider in the BFG KM2s. 345/75R16, which end up measuring to about 36.5x13.5x16 and 365/75R16 which measure out to 37.5x14.5x16. Only thing id with tires this wide you're probably looking at getting 16x10 rims. I've been considering both these sizes for my nest tires, leaning toward the 345s so I can keep my D30 for a bit longer. If I can afford a ProRock 44 before then, then its the 365s. And the 365s are load range C, leading me to think they ride like a dream...

I like the Toyos, but one thing to keep in mind with the Toyos is that they are SUPER heavy. Those 37x14.5x15 tires that were mentioned weigh about 93 llbs each. Pretty sure both sizes of the KM2s weigh about 20 lbs or so less

 

I would compare the weight of each of your options too. I was dead set on Toyo's or Nitto Trail grapplers, until i discovered they weighed over 90lbs each!! I ended up going with 36" Irok Radials, while they might not last quite as long as a toyo, they are much cheaper, lighter, and ride just as nice if not better. They also measure taller than many 37" tires do.