The answer is maybe! There are a few issues, and your tire dealer should be able to take a look and answer these questions -- first, is the wheel well big enough? On the older Fun Finders, there was not a lot of clearance.
Second, do the holes for the lug nuts match up with the studs on the hub?
If you get your axles flipped, you will have more wheel well clearance for bigger wheels and also more ground clearance. The local Fun Finder dealer can do a flip for you -- they put the axle under the leaf spring. (Not sure if your unit has leaf springs or torsion bars??)
I got my axles flipped so that the back end would never hit going in and out of steep driveways -- the extra clearance is great for boondocking on rough forest roads, too.
But be aware that flipping raises the center of gravity a little, and it also increases wind resistance. I am glad I flipped, but these are issues to consider before you pull the trigger.