I would recommend the 1015s. Mine have 1025s, and they work fine, but the rear of the box has to be shortened to fit. Not hard, but it would be a lot easier to use the 1015, and less likely to damage the coupler or your fingers.
MT says the mounting height is slightly different, but I've found that the natural variation in mounting heights from one car to the next make it a wash. My 1025s didn't need any shim. On the other hand, MDC roller bearing trucks with 33 inch wheels required a little grinding on the underside of the slope sheets, so like James said, the MT truck is probably a better bet. If you use a truck that comes with 33 inch wheels, and replace them with 36 inch, you may have to file the bolster a little to get the coupler back down where it should be.
Does MT make a proper 100 ton truck with 36 inch wheels? I looked on their website a while back and didn't see one.