Snippet to alter WooCommerce product weight and dimensions dynamically. Supports PluginHive Shipping Plugins: https://www.pluginhive.com/product-category/woocommerce-plugin/woocommerce-shipping/

functions.php

function filter_get_hook_prefix_weight($this_weight, $instance) {

    if (!$this_weight) $this_weight = .6;
    return $this_weight;
}

function filter_get_hook_prefix_height($this_height, $instance) {

    if (!$this_height) $this_height = 20;
    return $this_height;
}

function filter_get_hook_prefix_width($this_width, $instance) {

    if (!$this_width)  $this_width = 20;
    return $this_width;
}

function filter_get_hook_prefix_length($this_length, $instance) {

    if (!$this_length) $this_length = 20;
    return $this_length;
}

add_filter("woocommerce_product_get_height", 'filter_get_hook_prefix_height', 19, 2);
add_filter("woocommerce_product_get_width",  'filter_get_hook_prefix_width',  19, 2);
add_filter("woocommerce_product_get_length", 'filter_get_hook_prefix_length', 19, 2);
add_filter("woocommerce_product_get_weight", 'filter_get_hook_prefix_weight', 19, 2);