standard with 215/75/R15 tires, which is what I have on my T100 right now. Although when I put heavy loads in my bed the rear tires buldge (they are rated for 1742 lbs each tire, but even when I only have 500lbs or so in the bed the tires start bulging and I can feel the rear end getting sloppy on corners)

Looking on tirerack, there was an optional 235/75/R15 tire size. Did T100's with the 235 sized tires use the same wheel as the 215 sized tires, or did they come with a wider factory wheel?

I'm asking because 235/75/R15's have a larger weight limit per tire. So with those I can put larger payloads in the bed before the handling gets sloppy.