$request['RequestedShipment']['PackageCount'] = '1';
$request['RequestedShipment']['PackageDetail'] = 'INDIVIDUAL_PACKAGES';
$request['RequestedShipment']['RequestedPackageLineItems'] = array('0' => array('Weight' => array('Value' => $_POST['dweight'],
                                    'Units' => 'LB'),
                                    'Dimensions' => array('Length' => $_POST['dlength'],
                                    'Width' => $_POST['dwidth'],
                                    'Height' => $_POST['dheight'],
                                    'Units' => 'IN')),
                                                                 );