There are a total of 7 unique vehicles in the game. Some of them are really easy to get; just get to their location and ride them to register them permanently to your Car on Demand app. Since they are unique, you can't change their default paintjobs and some may even have a slightly noticeable performance enhancement.
This hippie van is located in an apartment parking slot north of the small park in the Painted Ladies district. There are no security or other hindrances so just find the vehicle and enter it to register it to your Car on Demand app.
This off-road jeep is located inside a locked, fenced-off area. You have to hack the CCT inside so you can either drive a van near the gate and have your jumper on it to cross over the gate or just use the remote forklift nearby. After hacking the CCT, you can now unlock the gate. Hop on the vehicle register it to your Car on Demand app.
This scooter is found in one of the private residences in the southern portion of San Mateo. There’s one guard and one robot sentry guarding the property. In order to drive the scooter away from the premises, you have to hack the CCT in the yard first to unlock the gate. It’s important to ensure that the guard and the sentry doesn’t spot you since they can both call reinforcements. It is easier to deal with the robot if you have the Robot Exploit skill. You can use it to disable the robot. Otherwise, you can activate a lethal proximity trigger near the gate since the guard will go there as part of his/her patrol. You can then deploy your jumper and hack the CCT when the robot is moving away.
This pick-up truck is found on top of a stack of container vans in the Port of Oakland. If you have Vehicle Directional Hack, you can remotely control the vehicle forward to let it fall to the ground. Once there, simply enter the vehicle to permanently register it to your Car on Demand app. If you resume a game session or reloaded your game and the car’s not in the container, fast-travel to a hackerspace then travel back again the Axle boardshop near the port to find the car in the container again.
This special ambulance is found in the middle of two warehouses in the northern tip of Yerba Buena Island. Simply walk in there and enter the vehicle to permanently register it to your Car on Demand App. This vehicle also leaks hazardous green gas and will have a different radio frequency.
This rally race car by Sumitzu Auto is located along the small dirt road west of Kirby Cove. Simply walk in there and enter the vehicle to permanently register it to your Car on Demand App.
This is cleverly hidden inside an underground parking lot beside the Skyswift Building. The garage door containing the unique vehicle is locked so you have to find and hack the connected CCT first. Head east of the Skyswift building to find the SVNR building. Find the vent in the southwest side of the building, by the grass. Deploy your jumper and enter through the vent. Continue following the vent until the jumper gets inside the other garage.
The CCT is located behind a wooden plyboard. In order to destroy this, your jumper should be capable of deploying ESDs or Explosives. Don’t use explosives since the nearby vehicle may cause a chain explosion, destroying the unique vehicle as well. Instead, deploy an ESD, get your jumper at a safe distance then detonate it remotely. The shock blast should be powerful enough to shatter the plyboard but not cause a devastating explosion. Hack the CCT then open the garage doors. To reach it, find the underground parking entrance ramp in front of the Skyswift building to the west of the SVNR building. Ride the vehicle to register it to your Car in Demand app.