Hello, it appears that this machine can only do 2x 250 trays, & 1x 500. In other words, you will have 3 trays not including the MP tray(tray 1), but tray 2-3 will hold 250, and a 4th tray will be the 500. Here is a link, look under "Paper Handling Options", it will show the break down of the tray options.
Hope this helps....