We already have table rate shipping wherein US shipping will be $13, Alaska and outside of the US will be $38. On top of it, we want to have rush shipping addition of $25. I was able to add custom shipping by following https://devdocs.magento.com/guides/v2.3/howdoi/checkout/checkout-add-custom-carrier.html. But the issue is within rush shipping. For the view/edit cart and step 1 of proceeding to checkout, I was able to calculate rush shipping $13+$25 = $38. But on the last step it keeps show $25 rush shipping. How can I display same $38 rush shipping on last step? I was able to debug to CartTotalRepository. I put in this line hoping I can fetch all the shipping methods
$rates = $address->collectShippingRates()->getGroupedAllShippingRates();
My aim is to fetch the current table rate and do the math to add on top of custom shipping. But at this step, it only yields 1 shipping method custom shipping.