I cut the Andersens for my X19H. Work fine, just be sure to cut through the solid web between the cylinder cutouts. Be prepared for the biggest plastic snowstorm ever if you use a power saw to cut. Cleanup took longer than the cut.
You might also want to err on the side of extra slack. They fit fine for the original Goodyears, but the new Maxxis seem to be just a little bit larger and they are a tight fit now. The grip mats are a great idea; Andersen offers them now too, but I found the solution on my own when we had problems with slippage.
2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.