How do you replace all the tires on a 5th wheel?

Tire Kingdom had me spot it in the parking lot next to the building where the tire monkey jacked up one wheel at a time, changed and balanced that one, replaced it and went on to the next one. He used a floor jack under the frame just ahead of or behind the spring shackles and an air impact wrench (except for the final torque wrench sequence on each wheel).

Took a little over an hour for all 4. I tipped the kid $20 for the extra effort.