As to the Phoenix question, I don't know. But I was running Michelin XCOACH tires and found them to be undersized regarding weight bearing capacity. I switched to Dunlop 315/80R22.5 on the steering axle. The XCOACH tires at full pressure of 123 psi maxed out at about 8,270 lbs (was it?) and my coach when full of fuel and fresh water was just over that XCOACH capacity. The 315s at 130 psi max out at 9,090 lbs (I think it is), and these 315s are cheaper by a couple hundred dollars per tire. ...something to look at... I still have the 295/80R22.5s on the other six spots. Ohhh... also, you need to have 9 inch wide rims to get the full weight bearing capacity out of the 315s. Many, if not most, Beaver coaches have 8.25 inch width rims (I think). My coach has 9 inch rims in all eight spots. I will need to replace the other six tires within a year or so too.