What should you ensure regarding the trailer when the iron supports are up and the trailer is resting on the tractor?

When the iron supports of a trailer are raised and it is supported by the tractor, it's crucial to ensure that there is enough clearance between the tractor frame and the landing gears. This clearance is necessary to prevent any potential interference between the two components during operation. If the landing gears or legs make contact with the tractor frame, it could cause damage and affect the stability and safety of the trailer during transport.

Ensuring adequate clearance also helps facilitate better maneuverability and reduces the risk of wear on the equipment. Therefore, maintaining enough distance is an essential part of safely operating a combination vehicle.