Save 2 templates in the same firebase id

I have 2 models, the delivery and the vehicle, I need to save the data of the two models in the same%% of the database, I did the following, I used the vehicle. id but did not save:

private void cadastrarEntregador() {
    autenticacao = ConfiguracaoFirebase.getFirebaseAutenticacao();
    autenticacao.createUserWithEmailAndPassword(
        entregador.getEmail(),
        entregador.getSenha()
    ).addOnCompleteListener(
        CadastroEntregadorActivity.this, 
        new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (task.isSuccessful()) {
                    snack("Conta criada com sucesso");
                    entregador.setId(task.getResult().getUser().getUid());
                    entregador.salvarDados();
                    veiculo.salvarDados();