It is recommended use 'mods' folder, this article explains how: http://openiv.com/?p=1132

This mod replace the Roller Car appearence.

How does it work:
You need install Menyoo PC [SP] script by MAFINS. Press F8 during the game, go to the Funny Vehicles category and select Roller Car or Bumper Car.

It is not yet possible to edit or add vehicles. It's just a object.

Bugs:
* Some textures disappear

Installation:

Open your OpenIV, in edit mode.

"Huayra Cinque"
Go to:
GTA V\x64w.rpf\dlcpacks\mpindependence\dlc.rpf\x64\levels\gta5\props\dlc_lev_des.rpf\
Replace:
-ind_prop_dlc_roller_car.ydr