CREATE TABLE table_6013 ("Type" TEXT, "wheelbase" TEXT, "M39 series" TEXT, "M809 series" TEXT, "M939 series" TEXT)

Name the M809 series for short wheelbase and M939 series of M931/932
SELECT "M809 series" FROM table_6013 WHERE "wheelbase" = 'short' AND "M939 series" = 'm931/932'
SELECT "M809 series" FROM "table_6013" WHERE "M939 series" = 'm931/932' AND "wheelbase" = 'short'