The "HD" means Heavy Duty...when you need more payload than a std NPR will carry, this is the truck for you! The Gasoline Engine might be your best bet if you're doing mostly local deliveries, use multiple drivers, or need raw power at all speeds... Loaded with Premium Features--Power Windows and Door Locks, Tilt/Telescoping Steering Wheel, AMFM/CD Player,Back-Up Alarm and more... Body is 14ft Box--Fully Lined w/(1)Row E-Tracs/Side--Hardwood Flooring--Roll-Up Rear Door--HD Step-Bumper and more... 2016 Isuzu NPR-HD w/ 14ft Box (Dry Van Body) - GAS