I'm curious about this as well, our 2017 2300 doesn't have leather but I think it would be nice to have and easier to clean.. I know it's an option through forest river and one of the other new sunseekers we were looking at had it on it and it appeared to be the same seat with just a new cover but I'm a little scared to ask the dealer the cost to order just the cover but I can't find them anywhere online.
We have katzkin leather in our jeep and it was 1200.00 installed but that was for all the seats and to add heated seats to the front also so maybe I'll bite the bullet and ask... I'm also looking for a full carpet kit for the cab area of the ford E series but I'm having just as much trouble finding it as well!
Keep us posted if you find some!
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