The PW Transit (On tour 2.2) that I've been recently leaning toward, sadly, doesn't have the OEM spare, I'd guess owing to the position of the generator.
They come with some sort of inflator / sealant spraying gizmo as a "fix," you might say, but it's a poor one in my opinion.
There's a Utoob video of a couple (who make many videos about their PW) who had a flat caused by a good sized chunk of metal and who wound up getting their van towed on a flat bed truck - nearly dragging the generator getting the van on and off the truck.
Plugs are a possibility as a backup, but then I wouldn't want to be laying on the ground, say, in the summer in the Southwestern U.S., trying to get a plug into an interior tire on a dually rig!