CREATE TABLE table_34217 ("Player" TEXT, "Position" TEXT, "Games started" TEXT, "Hometown" TEXT, "Height" TEXT, "Weight" FLOAT, "Class" TEXT, "Previous experience" TEXT)

Position of fullback has what highest weight?
SELECT MAX("Weight") FROM table_34217 WHERE "Position" = 'fullback'
SELECT MAX("Weight") FROM "table_34217" WHERE "Position" = 'fullback'