This is a great tool to visually compare wheel specs and different sizes quickly. The basic thing to look for and avoid would be the case where the new wheel & tire combination is closer to the hub than the original correct? As long as the new wheel & tire combo put the inner edge of the tire further away from the hub, then all should be well
I doubt like hell you will find a backspace more than stock which is 6 1/8" so I wouldn't worry about it. I run stock wheels without wheel spacers and it works but it wasn't easy. I originally bought a RK 2.5" xfactor lift but had to purchase MetalCloak control arms because they bend inward like stock control arms. My 315/70R17 tires would also turn into the bulky RK swaybar links. I had to purchase synergy swaybar links because they were skinnier at the top. Also note I have a Rubicon. No way a non Rubicon could use stock wheels and larger tires without wheel spacers.While I'm asking for help...I hear you on the offset of +10 to +20 would be the preferred range, but does backspacing come into play or does just focusing on the offset provide the simplest way to gauge?