There is a Sultan RS that respawns on GTA IV. This vehicle can be found well hidden behind the old garages/sheds in the grounds of the ruined mansion in Westdyke, Alderney. This is the old mansion that Niko drives the hijacked van full of coke to for Phil Bell. It is in the north of Alderney and the track leading to the old house is just over the road from the Burger Shot there.
Regarding the cars Niko has to find for Stevie (there are 30 of them), Stevie will text Niko with a location and photo of each vehicle.
If you want more details of where the 30 are hidden, checkout a good GTA site: gtawiki
that depends if the vehicle fits in your garage
This would be a huge amount of information to collate, as there are so many kinds of vehicles in GTA San Andreas. If you want to check this out easily, suggest you have a look at the gtawiki site, which is has all the vehicles catorized, photographs, and locations in each GTA game.
flying vehicles a cars witch can fly
there is 1
No, there are only Pay & Spray shops to change the colour of vehicles.
Apart from being able to keep vehicles in the garages or driveways of CJ's acquired safehouses, you can also keep vehicles (including the tank, if you can get it, and a Sea Sparrow chopper) in the large hangar opposite the Flying School in Verdant Meadows. Just drive the chosen vehicle to be stored up to the doors of the hangar and they will slowly open up completely to enable you to drive in.
no
I don't think there are any bikes in GTA III. But suggest you check the gtawiki site for vehicles in various GTA games, and also for any cheats or modifications.
GTA games take long to load because as you can see, you can do many things and if you were a game designer like me you would understand more clearly but all the things that move in the game and all the guns and vehicles you use in GTA are called sprites, if you use alot of sprites in a game it will take a while to load
As you cannot spawn helicopter using a cheat code.You need to download Ultimate trainer for gta Vice city.Then use it to spawn the helicopters and other vehicles.
When you get 5 stars, the SWAT come in with heavily armored vehicles and SMG's for weapons.
You can find the vehicles for GTA V in the wiki provided in the related links