public static function allTrunks()
{
$instance = new static();
$grammar = $instance->getConnection()->getQueryGrammar();
$rgtCol = $grammar->wrap($instance->getQualifiedRightColumnName());
$lftCol = $grammar->wrap($instance->getQualifiedLeftColumnName());
return $instance->newQuery()->whereNotNull($instance->getParentColumnName())->whereRaw($rgtCol . ' - ' . $lftCol . ' != 1')->orderBy($instance->getQualifiedOrderColumnName());
}