I have a built in spare and I also carry a can of self inflating tire sealer designed for trucks (Walmart-less than $10), a good jack and a small aircompressor capable of 100psi. I have used all three of these on various rigs over the years.
Whoops! Almost forgot. I also carry one of those little tire repair kits from Harbor Freight whereby you pull out a nail, ream out the puncture hole, insert some self vulcanizing plugs and make a temporary repair. I have no idea if they work or not but I have one in case I am desperate.
Another thing I wouldn't leave without is a good set of jumper cables that are long enough to reach from my coach batteries to the chassis battery.
PSW
2013 Phoenix Cruiser 2350