If you have this game, get the "Vanity pack".  Free download, but i'd suggest trying to complete the game first, then get it, so as not to spoil a very good little single player racer.  But it does give you Big Trucks, Buses and the General Lee among all the rest listed below!  
 
 
Get it here:- 
http://burnouthints.webs.com/vanitypack.htm
Vanity pack adds:
-----------------
- 27 Community finishes
  Watson Burnout Roadster - Burnout Hints Roadster by Mr_bingley
  Hunter Citizen - Dutch Police mod by Mr_bingley
  Kitano Hydros Custom - Subaru mod by Mr_bingley             
  Carson Inferno Van - DHL Van mod by Mr_bingley              
  Carson Inferno BRT Van - A-Team Van mod by Mr_bingley       
  Hunter Racing Oval Champ - Party mod by Mr_bingley
  Kitano Touge Criterion - Vanity Pack mod by Mr_bingley
  Krieger PCPD Special - Carbon mod by Hellcopa
  Hunter Extreme HotRod - Carbon mod by Hellcopa               
  Hunter Citizen - FBI mod by LeMansRacer                     
  Kitano Hydros Techno - Drivers Ed mod by LeMansRacer         
  Rossolini Tempesta GT - Tempesta Dream GT mod by S-J        
  Hunter Civilian - Ubuntu mod by Jordanwb                    
  Hunter Olympus - No Vinyl mod by Rich0G007
  Carson GT Concept - Punisher mod by RichOG007
  Hunter Reliable Custom - No Vinyl mod by RichOG007
  Carson Annihilator - Demo Car mod by eLOs
  Hunter Civilian - Microsoft mod by hazard96
  Nakamura Ikusa Samurai - HKS mod by kaese88
  Jansen P12 - All Your P12 Are Belong To Us mod by slashcammas
  Carson Annihilator - Muscle mod by ouerbacker
  Carson Annihilator Phoenix - General Lee mod by ouerbacker
  Carson Fastback Special - Sporty mod by ouerbacker
  Hunter Oval Champ 69 - Hunter mod by ouerbacker            
  Jansen Toy P12 - Ribbit mod by smilingfrog
  Carson Toy GT Concept - Toy GT Flame mod by smilingfrog      
  Jansen P12 - mod by udreamibuild
- Not included
  Hunter Civilian - Taxi mod by RichOG007
- Pedestrian Vehicles
  Selectable while online, even in races! (The Swedish Racing Mod)
  A selection of the following is available:
  Trucks
  Trailers
  Buses
  Vans
  Pickups
  Taxis
  SUVs
  Minivan
  Station Wagon
  Saloons
  Civic
  Limo
- Custom Pedestrian Vehicle Names & Information
- Sponsor Vehicles
  Now for the PC!
  A selection of the following is available:
  Jansen P12 Diamond
  Kitano Micromania Custom
  Nakamura B'z Ikusa GT
  Kitano Gamestop Sport
  Hunter BestBuy Oval Champ
  Carson Circuit City Hot Rod
  Krieger Walmart WTR
  Carson "Steel Wheels" GT
 
- Non-paintable Bikes Unlock
  This unlocks bikes that could not be repaired or painted. If
  you could not select all country variations of the Nakamura
  Firehawk GP Competition then you've run into this defect in
  the original game. This patch unlocks those bikes.
- Customized Menu Graphics
  Not much here but some branding.
- Customized Paradise City Graphics
  Spiced up surroundings including:
  Burnout Hints billboard by Mr. Yeah
  Billboards
  Road Signs
- Horns
  Use this one wisely! Don't be a pest.
- Flames and Hovering
  Add flames to your vehicle, or all vehicles. A few vehicles can
  also hover, including:
   Hunter Takedown 4x4 Toy Car
   Carson GT Nighthawk
   Nakamura Firehawk GP Competition Toy Bike
- Off-road Mode (experimental)
  That's right! You can now drive off-road in pretty much any spot
  that you can reach by jumping or by showtiming. Beware of water,
  though!
  Is this the closest thing to Big Surf Island on the PC?
  (i.e. driving pretty much anywhere off-road)
- Stealth Mode (experimental) and Takedown Battles
  A stealth mode has been added. Using this mode you will be able to
  turn off player names above vehicles and map markers. It can be used
  together with the new Takedown Battle custom challenges to make a
  new game mode. The new challenges are:
   2 Player Freeroam Challenge 49: Billboard Top 10
                                   INDIVIDUAL: Smash 10 Burnout Billboards.
       Vanity Pack: Takedown Battle
                    As a team get 10 Takedowns in Downtown Paradise.
                    Who will be crowned the takedown king?
   3 Player Freeroam Challenge  2: Driver Destruction
                                   INDIVIDUAL: Smash 1 Burnout Billboard.
      Vanity Pack: Takedown Battle
                   As a team get 20 Takedowns in Palm Bay Heights.
                   Who will be crowned the takedown king?
   4 Player Freeroam Challenge 14: Billboard Intro
                                   INDIVIDUAL: Smash 1 Burnout Billboard.
      Vanity Pack: Takedown Battle
                   As a team get 40 Takedowns in Downtown Paradise.
                   Who will be crowned the takedown king?
   5 Player Freeroam Challenge 24: Smashing!
                                   INDIVIDUAL: Smash 2 Burnout Billboards.
      Vanity Pack: Takedown Battle
                   As a team get 60 Takedowns in Palm Bay Heights.
                   Who will be crowned the takedown king?
   6 Player Freeroam Challenge 47: Billboard Hunt
                                   INDIVIDUAL: Smash 5 Burnout Billboards.
      Vanity Pack: Takedown Battle
                   As a team get 80 Takedowns in Downtown Paradise.
                   Who will be crowned the takedown king?
   7 Player Freeroam Challenge 50: 4 Billboards
                                   INDIVIDUAL: Smash 4 Burnout Billboards.
      Vanity Pack: Takedown Battle
                   As a team get 90 Takedowns in Palm Bay Heights.
                   Who will be crowned the takedown king?
   8 Player Freeroam Challenge 32: Billboards... Go!
                                   INDIVIDUAL: Smash 5 Burnout Billboards.
      Vanity Pack: Takedown Battle
                   As a team get 100 Takedowns in Downtown Paradise.
                   Who will be crowned the takedown king?
- Automatic Backup of Savegame
  Vanity Pack makes a backup of your current savegame with every run.
  If you don't want this, start it with a "/n" switch and no backup
  will be made.
- Steam Support
  As far as we know, Vanity Pack is now compatible with Steam.
All good and all free!   
