moving up from 16's to taller wheels on '92

[stillwater]

I'm looking to move up to a taller wheel size that, when combined with the tire will be roughly the same height/width/offset as my current LT285/75/R16s on my LS powered 92 4X4, no lift kit but with front-end level kit. I'm doing this to improve handling at highway speeds. But still get through a crappy Indiana snowstorm.

Any ideas, are there any conversion charts available? I would like to go with at least 18's, maybe bigger(?) And what tire size?

If nothing else, I could swap tire/wheel in the winter like I used to do on my cars when I was a kid lol. And use street tires in the summer. BTW, they are 6-lug wheels.