I have been looking at getting a set of Interco Super Swamper Radial Tsl's, I was planning on going all out and getting a bigger set of rims, but looking at the site I see they have a 31 x 9.50, which will sit on a 15x7 rim. My rims are rockcrawler 15x7's, would this heavier rim and tire make a noticable difference in the speedometer or wear out my 3.55 axles? I would like to stick with stock setup for awhile, but be able to get a bigger tire to accent the 2 inch lift I installed. Thanks!