<?xml version="1.0"?>
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:n*emphasized text*oNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
        <type name="VendorModuleModelRateResult">
            <plugin name="vendor_shippingrules_update_rate_result"
                    type="VendorModuleModelPluginShippingRateResultAppend"
                    sortOrder="10"
                    disabled="false"/>
            <plugin name="vendor_shippingrules_update_disabled_or_enabled_rates"
                    type="VendorModuleModelPluginShippingRateResultGetAllRates"
                    sortOrder="11"
                    disabled="false"/>
        </type>
    </config>

/**
 * Copyright © 2016 MageWorx. All rights reserved.
 * See LICENSE.txt for license details.
 */

namespace VendorModuleModelPluginShippingRateResult;

class GetAllRates
{

    /**
     * Disable the marked shipping rates.
     *
     * NOTE: If you can not see some of the shipping rates, start debugging from here. At first, check 'is_disabled'
     * param in the shipping rate object.
     *
     * @param MagentoShippingModelRateResult $subject
     * @param array $result
     * @return array
     */
    public function afterGetAllRates($subject, $result)
    {
        foreach ($result as $key => $rate) {
            if ($rate->getIsDisabled()) {
                unset($result[$key]);
            }
        }

        return $result;
    }
}

namespace VendorModuleModelPluginShippingRateResult;

    class Append
    {
        /**
         * @var MagentoCheckoutModelSession|MagentoBackendModelSessionQuote
         */
        protected $session;

        /**
         * @param MagentoCheckoutModelSession $checkoutSession
         * @param MagentoBackendModelSessionQuote $backendQuoteSession
         * @param MagentoFrameworkAppState $state
         * @internal param Session $session
         */
        public function __construct(
            MagentoCheckoutModelSession $checkoutSession,
            MagentoBackendModelSessionQuote $backendQuoteSession,
            MagentoFrameworkAppState $state
        ) {
            if ($state->getAreaCode() == MagentoFrameworkAppArea::AREA_ADMINHTML) {
                $this->session = $backendQuoteSession;
            } else {
                $this->session = $checkoutSession;
            }
        }

        /**
         * Validate each shipping method before append.
         * Apply the rules action if validation was successful.
         * Can mark some rules as disabled. The disabled rules will be removed in the class
         * @see MageWorxShippingRulesModelPluginShippingRateResultGetAllRates
         * by checking the value of this mark in the rate object.
         *
         * NOTE: If you have some problems with the rules and the shipping methods, start debugging from here.
         *
         * @param MagentoShippingModelRateResult $subject
         * @param MagentoQuoteModelQuoteAddressRateResultAbstractResult|MagentoShippingModelRateResult $result
         * @return array
         */
        public function beforeAppend($subject, $result)
        {
            if (!$result instanceof MagentoQuoteModelQuoteAddressRateResultMethod) {
                return [$result];
            }

            $filtableMethods = [
                'flatrate_flatrate',
                'ups_XDM',
                'ups_XPR',
                'ups_WXS',
                'carrier_method',
                // ... add here your method codes
            ];
            $methodCode = $result->getCarrier() . '_' . $result->getMethod();
            if (!in_array($methodCode, $filtableMethods)) {
                return [$result];
            }

            /** @var MagentoQuoteModelQuote $quote */
            $quote = $this->session->getQuote();
            $quoteItems = $quote->getAllItems();
            $heavyWeightFlag = false;
            foreach ($quoteItems as $item) {
                if ($item->getWeight() > 100) {
                    $heavyWeightFlag = true;
                    continue;
                }
            }

            if ($heavyWeightFlag == true) {
                $result->setIsDisabled(true);
            }

            return [$result];
        }
    }