I don't see why you couldn't buy some ball bearing slides and put them on. I would just get on ebay or lowes and find some slides the right length. you may have to drill some holes in the drawer to screw the new slides through.
my wife and I have a 3 year old beagle and a 1 year old black and tan/plott hound mix. they both sleep in the bed at night and during the day the go out for however long they feel like.
i had the ir231 for years and ended up buying a snapon mg725 and only had it a year and had to have it rebuilt already......the IR is def worth the money