Multi-location tractor trailer pneumatic connections

A heavy truck including a pressured air-supply system configured for activating one of a plurality of trailer air-supply connections on the truck, said heavy truck comprising:

• a tractor configured for towing trailers of different configurations, said tractor having a chassis frame having a front frame portion upon which an occupant cab is carried and a rear frame portion to which variously configured trailers are hitchable;
• a first tractor protection valve and a second tractor protection valve, each configured for interconnection with a pressured air receiver on a connected trailer to supply pressured air thereto, each located on the tractor at a location remote from the other and wherein each tractor protection valve location is proximate a typical position at which a mating connection on a trailer will be located when hitched to the tractor;
• and
• a selector positioned on the tractor, said selector being operator-transitionable between a first configuration in which said first tractor protection valve is activated to supply pressured air and a second configuration in which said second tractor protection valve is activated to supply pressured air.