Our product mix includes an even split between products that ship small parcel and products that ship via an LTL freight carrier. We need to be able to provide live shipping rates within the BigCommerce checkout experience which is most easily done through an application called ShipperHQ. The challenge is that there is not currently an integration between ShipperHQ and Shipstation that would allow us to offer our Shipstation UPS rates to customers within checkout. This shouldn't be that difficult to do via API. Please consider adding this integration.