When I was planning on DD-ing my 80 again, my plan was to buy Hummer 37" take offs for cheap. Not an awesome tire by any means but the price is right for wearing out on the road and they look pretty cool.
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I would only do 17" rims. First reason is almost no 37's are made in 16" sizes, second is that 17" rims tend to have more backspacing (they are tucked in more). This is useful, because you can then space out the wheels with spacers to exactly what you want, which IMO is about a 4" backspace, which cannot be achieved off the shelf with your stock rims.
If I were in your shoes, I'd probably get Terra Grapplers for the AT's and IROKs for the MT's. The reason I haven't gone to two sets is that I don't put enough miles on my truck to justify it (7,500 - 10,000 per year). I just won't wear out a couple of sets before the useful life of the compound itself is fading.
That's why I run Trxus, but if money were no object and I didn't mind selling two sets of tires evry three years and buying two more new sets, why not? I'd just make sure your trail tires are decent to get you to the trail if you travel some distance - that to me is one of the biggest values of a road friendly MT.
hates to ride in my truck at this point.
ain't happy then we aren't either. Besides I would like to be able to here the stereo at 70MPH again...
When I was planning on DD-ing my 80 again, my plan was to buy Hummer 37" take offs for cheap. Not an awesome tire by any means but the price is right for wearing out on the road and they look pretty cool.

I just bought the 36x13.5x17 Irok Bias and love them. Actual diameter is 36.8, so basically a 37. I'm running them on the FJ cruiser steel wheels with 1.5 inch wheel spacers. You can usually pick up the wheels for about $250 shipped for a set. Tires were about $300 a piece. If you're getting a off road tire, I would highly recommend going with a bias ply. Much nicer ride in the woods, cheaper, lighter, and better traction. Keep the stock 16s for a DD AT tire. Both 35s and 37s drive nice on the road. Biggest difference is the cost. I'll post some pics later, if you want.
I liked my duratracks for dd duty and they are great in the snow and ice to boot if that applies to you. I think the largest size is a 315 though. Im running 37x12.5x17 km2's on 4"bs'd rock crawler rims, they fit great and are surprisingly decent to dd with stock gears.
Note, for the 37's Id go with a 4" bs'd rim to negate the need for spacers.
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