I have an X595 with a factory 3PH. It is considered a limited Cat 1 and I can lift up a 400 lb ballast box with 8-9" of ground clearance. Check with your dealer because it may not be possible to install a full Cat 1 on your machine. He should also be able to provide you with all the lift specs for the limited CAT 1 hitch on a 585. Cat 0s are very limited, so even if it would fit on your machine, I would stay away from it.
Steve Z