Catalysis of the reaction: alpha-D-glucosyl-1,6-alpha-D-glucosyl-1,6-alpha-D-glucosyl-1,3-1-O-alkyl-2-O-acylglycerol + 3'-phosphoadenosine 5'-phosphosulfate = 6-sulfo-alpha-D-glucosyl-1,6-alpha-D-glucosyl-1,6-alpha-D-glucosyl-1,3-1-O-alkyl-2-O-acylglycerol + adenosine 3',5'-bisphosphate.
triglucosylalkylacylglycerol sulphotransferase activity