We have a 2015 Starcraft Aframe popup (1232) that we purchased new that is approaching 5 years old. I'm planning on changing the tires on it soon. No issues with them, but it's my understanding that tires should be replaced at 5 years. (ST17580R13) Should I change the Spare as well?? It has never been used and has a cover on it. Spare mounted on rear of camper, camper always garaged when not in use. Thanks!!