I always had kind of a tough time getting regular suspension underquilts to stay centered under my Clark NX-250. I happened to be looking at the Loco Libre Underquilts and they list one made specifically to fit the NX-250 and of course also fits the new NX-270. And when I say fit, they FIT!! Absolutely no fiddling around, just clip them on and you are good to go. There is really no way for them to get out of adjustment. Besides, they are one heck of a well made quilt! It takes a little while to get one, but well worth the wait.