Make cake mix according to the box's instructions. Bake in a 9X13 inch pan and cool completely
Mix the strawberries, sugar, and vanilla together. Refrigerate while cake bakes and cools
Whisk the pudding mixes and milk together until soft set
Cut the cake into one-inch cubes
Layer one-third each of the cake, strawberries, pudding, and whipped topping in a trifle dish or large bowl.
Repeat layers until all ingredients are used
Cover with plastic wrap and store in the refrigerator