This video shows how to find a leak in a radial tubless tire and repair it with a plug kit. This is the method most gas stations and auto repair shops will use. You can do this on the road If it is obvious where the leak is. You don't always have to remove the tire from the vehicle. Good idea to have a 12 volt DC air pump that runs off your car battery and keep it in your trunk for such situations.
Get a tire repair kit and keep it in your trunk. Don't get stuck and have to wait for a tow truck or spend $25 at a gas station. Fix it your self and keep moving forward. I hope you enjoy the video!