"I was gonna put tubes in something or other, generator?, but then realized I didn't know how to take off the tires. I've done bicycle tires but nothing else. Any links on how? Bigger tire irons, I guess." It's basically the same as a bicycle tire, larger irons or a couple of big flat bladed screwdrivers. Take one bead off the rim and stuff the tube in. Be REAL careful not to pinch the tube when putting the one bead back over the rim. "not in favor of using tubes in tubeless tires." Cheaper than buying a new tire for a leak that you can't plug.