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That's a good way to do it too but I prefer the gladhand because I don't have to have the cab door open while I'm filling tires or using the air line. Typically only an issue if it's cold, windy or wet....or D all of the above.:D But in all seriousness any way you can utilize the air system is...

Truck stops sell the glad hands by themselves for less than $10. You want the "red" glad hand that connects to the "emergency" air line on the truck. It is the full air pressure line. The "blue" or "yellow" line is the service line that sends air pressure to the trailer to activate the brakes...