[sergio_xd]

tenta usar isso:

pawn Code:

AttachTrailerToVehicle(id do trailer Ex: 2,GetPlayerVehicleID(playerid));//2° opзгo e o id do carro do jogador

exemplo:

no topo do gm:

pawn Code:

new Arado;

no

pawn Code:

public OnGameModeInit( )
{
    Arado = AddStaticVehicleEx (610, 2109.1763, 1503.0453, 32.2887, 82.2873, 0, 1, 15 );
}

no

pawn Code:

//
public OnPlayerKeyStateChange(playerid,newkeys,oldkeys)
{
     new playerState = GetPlayerState(killerid);
     if((newkeys == KEY_JUMP) && playerState == PLAYER_STATE_DRIVER)//Botao que pula....
     {
          new Float:vehx, Float:vehy, Float:vehz;
          GetVehiclePos(Arado, vehx, vehy, vehz);
          if(IsPlayerInRangeOfPoint(playerid,10.0,vehx, vehy, vehz))
          {
               AttachTrailerToVehicle(Arado, GetPlayerVehicleID(playerid));
          }
     }  
}

para soltar o arado:

pawn Code:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if (strcmp("/soltarA", cmdtext, true, 10) == 0)
    {
        DetachTrailerFromVehicle(GetPlayerVehicleID(playerid));
        return 1;
    }
    return 0;
}

espero ter ajudado