Personally for a 5 tier I would assemble the bottom 3 tiers and the top 2 tiers and deliver that way. Then add the 2 tier to the 3 tier…but if you have a really intricate design that can not be put together that way then just make sure you have enough support. The biggest tiered cake I have done is a 4 tier, but the tiers weren’t very high either. Have you seen Edna’s video on how to stack a cake? She delivers all her cakes assembled. It may help you!