Since acquiring a 4200 w/ R3 tires, I've been vexed at how "underinflated" the front tires appear when using the loader. Over time, it has gotten worse. Basically, the 4 ply OEM tires are not sufficient for the loader. Found some 6 ply ones at Miller Tire and finally sprung for them. Much improved! The Miller Tire web site says "If you have a loader, these are the tires for you." They were pricey but worth it.
I imagine that when it was new, the tires seemed sufficient. But over time, they have failed.
I imagine that when it was new, the tires seemed sufficient. But over time, they have failed.