TMC (Truck Drivers and Dispatchers Association) doesn't manufacture trucks; it's a trucking company and driver training organization. However, TMC Transportation, the trucking fleet operator, does equip many of its trucks with APUs (auxiliary power units) or sleeper cab power systems. An APU is an onboard generator that powers the cab's heating, air conditioning, and electrical systems without running the main diesel engine, which saves fuel, reduces emissions, and extends engine life. Many modern commercial trucking fleets, including large carriers, have been adopting APUs or idle-reduction technologies because of environmental regulations, fuel costs, and driver comfort. Whether a specific TMC truck has an APU depends on the year of the vehicle and TMC's equipment policies at that time. Newer tractors in professional fleets are more likely to have APUs or alternative power systems. Drivers should check with their specific fleet or dispatcher about whether their assigned truck includes an APU, as equipment varies across a company's entire fleet. Some trucks may have traditional sleeper packages with engine idling instead, while others use fuel-driven or battery-based APU systems.