ShipperHQ for WC (ver. 1.3.2 https://wordpress.org/plugins/woo-shipperhq/). Replace 'populateAttributes' method with one mentioned below in order to hook in and read cart item dimensions instead of static ones added to a product. It makes ShipperHQ compatible with UniCPO 4 plugin.

gistfile1.txt

/**
     * Reads attributes from the item
     *
     * @param $productData
     * @param $product
     * @return array
     */
    protected function populateAttributes($productData, $product)
    {
        $attributes = [];
        if($product) {
            //SHQ16-2202 use the $product as this is the parent or child product for configurable
            $productId = $product->get_id();

            foreach (self::$_stdAttributeNames as $attributeName) {

                $internalAttributeName = "_".$attributeName;
                $customAttributeValue  = apply_filters(
                	'shipperhq_custom_product_attribute_value',
	                get_post_meta($productId, $internalAttributeName, true ),
	                $attributeName,
	                $productId,
	                $productData
                );

                if (!is_null($customAttributeValue) && !empty($customAttributeValue) &&
                    !strstr($customAttributeValue, 'NONE')) {
                    $customAttributeValue = str_replace(',' , '#', $customAttributeValue);
                    $attributes[] = [
                        'name' => $attributeName,
                        'value' => $customAttributeValue
                    ];
                }
            }

            //SHQ16-2202 pass in correct productId for parent/child correct retrieval
            $this->populateMetaData($productId, $attributes);
        }
        return $attributes;
    }

@shipperhq ShipperHQ is a great service for calculating shipping rates. Unfortunately, it has to be tweaked a little bit in order to read dimensions from cart items, which can be set dynamically, instead of static values defined for a product. It does it for 'weight' but DOES NOT for 'width', 'height' and 'length'. So, I actually offer to add a filter so it will be possible to hook in and change the mentioned attributes dynamically.

It adds 'shipperhq_custom_product_attribute_value' filter.

The name of the filter can be changed. Specifically, this filter name is used to integrate ShipperHQ with UniCPO (https://wordpress.org/plugins/uni-woo-custom-product-options/) and add calculated dimensions to ShipperHQ and get shipping rates.