In the English games the truck serves no event purose; in the original game in Japan (Pocket-Monsters Green Version) if you had completely beaten the game (all 150 pkmn & e4) you could surf over to the truck and use Strength with all the Pokemon in your party. When you did so, you would see the truck move forward once. Afterward, you would see a lapras-like thing (surfing) come to the land you are at. He will then give you Mew.
Nintendo of America evidentally wanted Mew to be special, and only obtainable in Nintendo events.
THEY DID LEAVE THE TRUCK FOR A REASON! As you may have encountered throughout your Red or Blue version(s), there have been several sprite malfunctions. Most commonly in caves or on water: If you are to even to step near these certain areas and save the game or even open the menu, your sprite will be stuck and unable to move. The area right above where the truck is is one of those spots. Even in the Japanese Green version, once you pushed it aside and walked up, if you were to save the game or open the menu, when you continued your sprite would be unable to move.
~I know this because I downloaded the 40% translated ROM, It's messed up because Pokemon names are spelled with smiley faces, hearts, other designs, and glitch symbols.~
|||Does GreenVersion's Mew remind any of ya'll of a lizard?|||