Purchased to go along with the DW744XRS I also got from amazon.  They have saved me several times trying to do larger projects without taking up the space of a full blown outfeed table.  Having read the other reviews of the side support falling out and hitting the ground while wheeling the saw around, I installed the mounts for the side supports angled ever so slightly pointed inward.  This way when the support is slid all the way in, it wedges itself there ever so slightly.  This has kept the side support from falling out even when wheeled over rough ground or over large bumps (door thresholds and what not).  Hope this helps.