For Ram and Dodge.
Chassis-code is "ND" for 2005+ Dodge Dakota
https://www.imcdb.org/vehicles_make-Dodge_model-Dakota.html

Chassis-code is "DJ" for all Ram Heavy Duty 2500
https://www.imcdb.org/vehicles_make-Ram_model-2500.html
https://www.imcdb.org/vehicles_make-Ram_model-Heavy+Duty+2500.html

Chassis-code is "DP" for all Ram Heavy Duty 4500 and Ram Heavy Duty 5500
https://www.imcdb.org/vehicles_make-Ram_model-Heavy+Duty+4500.html
https://www.imcdb.org/vehicles_make-Ram_model-Heavy+Duty+5500.html

Chassis-code is "D2" for all Ram Heavy Duty 3500 (Pick-up).
It's for there:
https://www.imcdb.org/vehicle_1167771-Ram-Heavy-Duty-3500.html
https://www.imcdb.org/vehicle_610174-Ram-Heavy-Duty-3500-2010.html
https://www.imcdb.org/vehicle_1535498-Ram-Heavy-Duty-3500-2010.html
https://www.imcdb.org/vehicle_1051941-Ram-Heavy-Duty-3500-2010.html
https://www.imcdb.org/vehicle_1868019-Ram-Heavy-Duty-3500-2010.html
https://www.imcdb.org/vehicle_1012081-Ram-Heavy-Duty-3500-2011.html
https://www.imcdb.org/vehicle_1370517-Ram-Heavy-Duty-3500-2011.html
https://www.imcdb.org/vehicle_1408644-Ram-Heavy-Duty-3500-2011.html
https://www.imcdb.org/vehicle_584684-Ram-Heavy-Duty-3500-2012.html
https://www.imcdb.org/vehicle_554525-Ram-Heavy-Duty-3500-2012.html
https://www.imcdb.org/vehicle_928689-Ram-Heavy-Duty-3500-2012.html
https://www.imcdb.org/vehicle_755515-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1102823-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1396707-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1396747-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1308649-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1370495-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1152627-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1171954-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1125435-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1633304-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1715983-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1720845-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1735734-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1798669-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1849932-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1861755-Ram-Heavy-Duty-3500-2013.html
https://www.imcdb.org/vehicle_1772139-Ram-Heavy-Duty-3500-DS-2013.html
https://www.imcdb.org/vehicle_1218543-Ram-Heavy-Duty-3500-2016.html
https://www.imcdb.org/vehicle_1250441-Ram-Heavy-Duty-3500-2016.html
https://www.imcdb.org/vehicle_1310509-Ram-Heavy-Duty-3500-2016.html
https://www.imcdb.org/vehicle_1693660-Ram-Heavy-Duty-3500-2018.html
https://www.imcdb.org/vehicle_1911225-Ram-Heavy-Duty-3500-DJ-2019.html
https://www.imcdb.org/vehicle_1993924-Ram-3500-DS-2013.html

Chassis-code is "DD" for all Ram Heavy Duty 3500 (Chassis-Cab).
It's for there:
https://www.imcdb.org/vehicle_1185708-Ram-Heavy-Duty-3500-2010.html
https://www.imcdb.org/vehicle_1213899-Ram-Heavy-Duty-3500-2010.html
https://www.imcdb.org/vehicle_935402-Ram-Heavy-Duty-3500-2010.html
https://www.imcdb.org/vehicle_1027517-Ram-Heavy-Duty-3500-2010.html
https://www.imcdb.org/vehicle_1698479-Ram-Heavy-Duty-3500-2011.html
https://www.imcdb.org/vehicle_878726-Ram-Heavy-Duty-3500-2011.html
https://www.imcdb.org/vehicle_1516694-Ram-Heavy-Duty-3500-2011.html
https://www.imcdb.org/vehicle_1591306-Ram-Heavy-Duty-3500-2011.html

Chassis-code is "DS" for all 2010-2018 Ram 1500 and 2009+ Dodge Ram.
https://www.imcdb.org/vehicles_make-Ram_model-1500.html
https://www.imcdb.org/vehicles.php?resultsStyle=asImages&yearFrom=2009&yearTo=&makeMatch=- 2&make=dodge&modelMatch=1&model=ram&modelInclModel=on&modelInclChassis=on&mk=&origin=- &madein=&madefor=&role=

For there, 2009+ [DS].
https://www.imcdb.org/vehicle_1656270-Dodge-Ram.html
https://www.imcdb.org/vehicle_1578480-Dodge-Ram.html
https://www.imcdb.org/vehicle_1617969-Dodge-Ram.html
https://www.imcdb.org/vehicle_1992955-Dodge-Ram.html
https://www.imcdb.org/vehicle_1738505-Dodge-Ram.html

For there, 2013+ [DS].
https://www.imcdb.org/vehicle_1915037-Ram-1500-DS.html
https://www.imcdb.org/vehicle_2003278-Ram-1500.html
https://www.imcdb.org/vehicle_1999559-Ram-1500.html
https://www.imcdb.org/vehicle_1930013-Ram-1500.html
https://www.imcdb.org/vehicle_1799206-Ram-1500.html
https://www.imcdb.org/vehicle_1648767-Ram-1500.html

Source:
https://www.ramtrucks.com/assets/bbg/pdf/2016/docs/intro/modelcodeschart.pdf

Chassis-code is "DT" for all 2019+ Ram 1500.
https://www.imcdb.org/vehicles_make-Ram_model-1500.html
https://www.imcdb.org/vehicle_2011916-Ram-1500-DT.html
https://www.imcdb.org/vehicle_1831579-Ram-1500.html
https://en.wikipedia.org/wiki/Ram_1500_(DT)

For there, Make is "Ram", year is "2010+" and model is "Heavy Duty".
https://www.imcdb.org/vehicle_1728255-Dodge-Ram.html
https://www.imcdb.org/vehicle_1697536-Dodge-Ram.html
https://www.imcdb.org/vehicle_1386593-Dodge-Ram.html
https://www.imcdb.org/vehicle_1610118-Dodge-Ram-2010.html
https://www.imcdb.org/vehicle_1811406-Ram-1500.html
https://www.imcdb.org/vehicle_1728506-Dodge-Ram-2010.html
https://www.imcdb.org/vehicle_1852482-Ram-1500.html
https://www.imcdb.org/vehicle_1991142-Ram-1500.html
https://www.imcdb.org/vehicle_991719-Ram-1500.html