I'm trying to recall a 80's something cartoon where a group of people fight against the dinosaurs. It was something similar to Izenborg (Attack of the super monsters). The group used to fight these monsters through their hi-fi vehicle.
Whenever they were about to fight the dinosaurs, two of the vehicles would merge together to form a super vehicle. The dinosaurs were of a real kind (most probably people wearing dino suits) where as the others were of cartoon character.

I just can't remember the name of this series. Please help if anyone remembers this animated series.

So you're saying the dinosaurs were 'live action' and the rest of the show was animated? It sounds like it might be this:
RETURN OF THE DINOSAURS - YouTube

Exactly.. this is the one - You really are a movie expert!!
Thanks a lot mate!

Great! :)