Tires

I have a 2005 H2 adventure series with air ride suspension.  I have 325/60r20 tires on the truck now on 20x10inch rims.  I thought about putting 37inch tires on the truck instead of 35's.  I heard you have to trick the airride, do some cutting and turn up the torsion bars.  I was wondering if anyone has done this.  Good idea/ bad idea etc.