GM-GMC: chevy 2500, duty suspension, engine options

Question
what is the difference between a chevy 2500 and a 2500 HD

Answer
HD means heavy duty and has a heavy duty suspension and 2500 usually has smooth ride suspension
2500HD:
- Much heavier frame
- More engine options (Big block, diesel)
- More trans options (Especially ZF 6spd manual or Allison 5spd auto)
- Full Floating rear axle to handle heavy loads in the box or heavy tows
- Payload 3,554 lbs
- Tow 12,000 lbs hitch, 15,400 on 5th
- Harsher ride empty

2500LD:
- Frame inbetween 1500 and 2500HD
- Can only get the Vortec 6.0 V8 and 4spd 4L80E auto
- Semi Floating rear axle, limits to box load and tow load
- Payload 3,076 lbs
- Tow 10,200 lbs hitch or 5th
- Harsher ride empty than 1500, better empty ride than 2500HD or 3500.