Our Montana has rollers, but our HC only has slide bars on each end. If your's has rollers they might be the same as those on a Montana and you could get them from a dealer or trekwood.com. If you have slide bars, I'm told by my dealer that they lift the slides and take the old ones out and drop the new ones in, but I've never seen it done although I have paid for it.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.