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The 2021 Ram 2500 and 3500 Longhorn Mega Cab models equipped with the Cummins diesel engine came with a comprehensive suite of luxury and heavy-duty features, including premium leather and real wood interior accents, advanced Uconnect infotainment, and a variety of safety and towing technologies. 
The specific equipment can vary based on whether it was a 2500 or 3500 model, and which optional packages (like the Level 1 Equipment Group or Towing Technology Group) were added. 
Powertrain & Mechanical
Engine: 6.7L Cummins Turbo Diesel Inline-6 engine, available in two versions:
Standard Output (for 2500 and some 3500 models): 370 hp and 850 lb-ft of torque.
High Output (primarily 3500 models): 400 hp and 1,000 lb-ft of torque.
Transmission: A specially developed 6-speed automatic transmission was used with the diesel engines.
Suspension: The Ram 2500 featured a five-link coil rear suspension for a better ride, while a self-leveling rear air suspension was an available option on both 2500 and 3500 models.
Towing Equipment: Standard Class V hitch receiver, trailer tow harness, trailer light check, and an integrated trailer brake controller. 
Interior & Technology
The Longhorn trim focused on luxury, with real wood and leather throughout the cabin. 
Seating: Premium leather-trimmed heated and ventilated front seats, and heated second-row seats were standard. Mega Cab models offer extra rear legroom and reclining rear seats.
Infotainment: The Uconnect system was available with either an 8.4-inch or an optional high-resolution 12-inch touchscreen display featuring navigation, Apple CarPlay, and Android Auto.
Audio: A 9-speaker Alpine sound system was standard, with an optional 17-speaker Harman Kardon system available.
Convenience: Features included a heated wood/leather steering wheel, power-adjustable pedals with memory, dual-zone automatic climate control, and a wireless charging pad. 
Exterior & Safety
Exterior: Chrome accents on the grille, bumpers, and side moldings, LED exterior lighting (headlamps, fog lights, taillights, and bed lighting), power-folding and power-extendable tow mirrors, and side steps were standard or commonly equipped.
Safety & Driver Assist: Key safety features included:
ParkView Rear Back-Up Camera and front and rear parking sensors.
Blind Spot Monitoring with trailer coverage and rear cross-traffic alert (optional).
Forward Collision Warning-Plus and Adaptive Cruise Control (optional).
Electronic Stability Control, Trailer Sway Damping, and Hill Start Assist. 
The Mega Cab configuration adds significant interior volume, especially for rear passengers, making it a highly practical yet luxurious heavy-duty truck.