Our 2016 31W has a pretty large storage area in the back, it goes all the way under the bed. I have seen the newer ones have it cut in half for some reason. I assume it now has under bed storage inside instead. You could possibly remove the panel in between and have the larger outside storage. Ours also came with a spare tire mounted under the back. I made a mount for mine on the bumper so I could display my Disney Fort Wilderness tire cover.
As far as tires go I still carry the 16" spare but the wheels and tires on mine are now 17.5 commercial tires. Much less chance of needing a spare now.
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