maybe im missing the point here, so forgive me...
im run 20x10 Rockstar rims with a 37 inch BFG MT tire on my 2003 H2.
unless you stay with a 35 inch tire, there WILL be some rubbing on the front end.. it might be on the back inner well ( platic and easily to trim) or it will be on the sway bars. mine rubbed ont he plastic innerwell.
there is no rubbing on the back end, and my tires stick out past the fender well.
If you are concerned about your rear tires hitting your fenderwell, you are doing something wrong somewhere.
it doesnt matter really what size rim you want, or buy.... its the overall tire size that is going to matter. you can buy a 34 inch rim, and a 35 inch tire to fit that rim.. ya its only 1 inch of rubber, but regardless it is still only a 35 inch wheel, which is stock on H2's.
now, if you have the airride suspension in the back... then there are some tricks that you will have to do depending on the width of tire you buy.
if you buy a tire that is only 12.5, then you dont need to do anything except mount the tires and drive away.
if you are buying a 13 inch + wide tire, you need to modify the air ride sensor on the drivers side rear tire well. it is a very very very easy mod, and should take no more than 10 mins start to finish. this is a must for tires this wide.
do not let anyone tell you different... and again, this is only if you have the air ride. if you have springs, then you are fine.
so, what am i missing?