Ours came with a spare. We bought an electric impact gun from Harbor freight that works great. Just start the Genny and plug it in. Comes in a nice plastic case that I keep the correct sockets in. When I had a flat it was the inner dual. I took out a ramp and put it on the outer dual and drove up. Then went under and used the bottle jack to lift it. The ramp just made it easier to get under and then I only had to used the jack to lift it about a 1/2". Used the impact to change everything and then a breaker bar for the final tightening. Took about 1/2 hour.