All the cars in the game have fully functioning and realistic suspension.. (Well, the standard cars that come with the game anyway. Some mods don't have realistic suspension or anything.)
You know, there is only one single post on this forum which made me facepalm more than this one, just 1 and that was an amazing quote from AwesomeSauce suggesting that you should only ever use the top gear of a car because you have more power.
Lol, you didn't read the other posts then? Gabester is utilising this thing called sarcasm because every single vehicle included with the game has this wonderful thing called suspension - even the D15 in the tech demo version, even the nasty "russian" mods usually have it and just about every single community mod. Its like me going to audi and suggesting they stick an engine in their cars. They have an engine the same way BeamNG has suspension.