tire size clarification please

[Hellz]

so i have done alot of searching on this issue. i just can get a clear answer. alot of the posts says you can do this, but the next post says you cant.
one says you will get some tire rubbing, and the next says that its minor, the next says you need to pull out plastic.

so here is my issue.

im looking to purchase some KMC Rockstar rims (yes, more rockstars)
20x10

for tires, i want to run with a 37 inch tire, and this is where my issue is.
can i run a 37x13.5 inch tire without any issues?
stock H2. no lift with the air ride in back ( i know i need to move the sensor)
would i need to move to a 37x12.5 instead.

im fine with some light tire rubbing as long as nothing is getting damaged.
i can always crank the TK to raise it a little, but that wont do anythign for the width issue.

so can someone give me a solid answer on what im safe to run without any rubbing at all, and what might be a little rubbing.

i am interested in Mickey Thompson MTZ tires.
i like the look of the Nitto MG, but dont like the loudness or the crappy tread life. the Toyo OC are not bad, but just lack the aggressive look.

thanks in advance