You could do that but you'll probably have to do a little more than just move the rails over to the right. That saw already has the ability to rip 36" on the right side and comes with a rail stiffener to help keep the rails parallel to each other. I don't know for sure if this will be the case but if you move the rails and increase the capacity to 48" you just may have to add another stiffener. If so, that would be no big deal as that part could be ordered from RIDGID.
Life is like a roll of toilet paper.
The closer it gets to the end, the faster it goes.