I'm having difficulty grasping the whole backspacing topic. I've seen the links with diagrams and am trying to make sense of it all. I have some 31x11.5's and plan on purchasing new pro comp black steel rock crawlers. Performance4trucks has the wheels available in the right size, 15x10, but also in three different backspace settings, 2.5", 3.75", & 4.25". I dont want these to rub or stick out over the flares too much. what size should i be looking at? the deeper the back space the further the tire is situated under the wheel housing, right? so too much backspacing would lead to rubbing? Is that that right and what are your recomendations. Man I feel so incompetent.