Grand Theft Auto III/Import-Export Garage

At two locations on the Portland Docks and Pike Creek in Shoreside Vale, the player can deliver cars from a list of requests to get rewards and progress towards 100%. There are three lists to complete.

Once all the vehicles on a particular list are delivered, the garage will make them permanently available for free.

Securicar
The armored Securicar truck is a VERY rare vehicle spawn, and can be annoying to find.

Your safest bet is to get one during a mission. To keep it you'll need to put it in your garage and destroy it. This will fail the mission, but you'll keep the Securicar.The one mission where you can keep it without failing or blowing it up is 'Decoy' (Donald Love). They can also be encountered during Firefighter missions.

Alternatively, standing at the intersection in Aspatria directly southwest of the stadium and rotating the camera between the road directions to quickly spawn and despawn traffic seems to have the best success rate for finding one in the wild.

Moonbeam
Larger boxy van. Found across Portland. One can be found parked north of Toni's restaurant in Saint Mark's.

Coach
Passenger bus. There is a bus depot in Trenton very near the docks where these are parked.

Flatbed
These can often be induced to spawn by getting the Barracks OL military truck from Phil's place on north Staunton Island and driving it around the stadium.

Linerunner
Semi truck without a trailer. These are often parked around the Portland harbor.

Trashmaster
Garbage truck. These are fairly rare and can sometimes be found in Staunton and on Firefighter missions. Early on in the game you can acquire one from the mission 'Blow Fish' (Toni).

Patriot
Classic Humvee vehicle. One is parked at the Supa Save parking lot between the harbor and Callahan Bridge (just get out of the car to cancel the off-road checkpoint mission).

Mr. Whoopee
Another very rare ice-cream truck. If you haven't beaten the mission 'I Scream, You Scream' (El Burro) that is the easiest place to get one. Otherwise Firefighter missions have a slightly higher spawn rate.

Blista
Four-door minivan, common on Staunton Island. Frequently found parked around Newport including in the parking garage.

Mule
Large box truck that is common in the harbor area.

Yankee
Another large box truck that is common in the harbor area.

Bobcat
Pickup truck that can be found in Portland. There is one parked on the beach under the cliffside mansion near the docks.

Dodo
Fixed-wing plane that can be stolen at the airport. Recommend driving it back on the roads because flying (and especially landing anywhere coherent) is not easy in this GTA installment.

Bus
Can be found in Chinatown and Aspatria, although uncommon. Driving around a Coach

Rumpo
Large utility van often found in Trenton.

Pony
Medium utility van often found in Trenton.