Most so-called "leather" in RV's is actually bonded stuff that may or may not have an actual real leather skin. And if there's any real leather at all, it's vanishingly thin.
I'm not surprised yours is wearing so badly, and will be interested to hear whether your rig's manufacturer will do anything about it. Frankly, I think it unlikely to be "guaranteed" for more than a year or so.
It may be that you don't have leather at all, but one of the "leatherette" substitutes that Fleetwood/Thor uses in many of its rigs.
Here's a link to a long discussion elsewhere on the subject of that kind of seatcovering- looks like lots of folks have had similar problems:
Deteriorating Ultraleather seats