urgent help gta 4 online

Hello everyone I am writing here because I hope in your help, sorry if my English is not perfect but I am Italian and I am using a translator to write here ...
I have a ps3 with FW 4.31 to tjogo original GTA IV online and I noticed many who use tricks tip dinosaur-shaped machines, shopping trolleys, toilets neon, speed and absurd.
I'm aware of google and I realized that it's script, I tried to follow some guides that say to move the file to a usb stick and insert it into the PS3 but does not recognize the file, is there a way to have these "trainer "mods or scripts??
look forward to your response, and I apologize if I opened a new post here if in case it is not the right section but then again I understand little English in speech, let alone in the script. :-)
and the only solution I could find and enroll here from you because I know that many of you are really good at modding ps3 with ...