Assembling the cake:

• Fill a piping bag with cream cheese frosting. 
• To make your cakes straight, cut off the domes of both layers of the cake. It's easiest to use a large serrated bread knife. 
• Spread 1/4 cup of Dulce de Leche over the bottom layer. 
• Spread remaining caramel apples over the bottom layer of the cake. 
• Pipe a thin layer of frosting over the apples. 
• Add second layer of the cake upside down, cut part down onto frosting. 
• Decorate the top by spreading a very thin layer of the frosting over the top first and then pipe some frosting over the edge. You can add some crushed pecans in the middle.
• Drizzle caramel topping all over the top of the cake.