Very similar tire/wheel package
I've got 20" wheels so similar to the ones you want to buy. I'm wondering if they're made by the same manufacturer with different names depending on vendor. Anyway, the tires I have are Yokohama Parada's Spec-X 265/50-20 and they just fit with no clearance problems. Only had to tweak the torsion bars a few turns for clearance. NO cladding interferance at all.
I noticed you were looking at 55-series tires. With the 275 width and the tallness of the 55's I believe you WILL run into problems with cladding for sure! Hope that helps in your decision. By the way, I love the Parada's. Scott