I have a 2014 2250SLEC Sunseeker. As bclemens has mentioned, there is no spare.
I read many articles on this forum about putting a spare or anything on the rear
bumper. Their opinion was that it's only good for the sewer hose. I ended up getting the Curtis tire support that mounts on the rear hitch, as mentioned previously. As for the tire rim, I bought a reconditioned STL 5125 Chevy Dually Steel Wheel (30 lbs).
I also went with the General Grabber HTS ( about 32 lbs). The 2300 (similar to the 2250) uses a Geo-Trac tire, which would have been cheaper but I thought that I couldn't go wrong with the standard tire for the Chevy 4500. I hope I will never need it but if I do I'll have a spare that's the same as the other tires.