I agree with everything Carol and Harriet (CakeyCake) have said, although I actually deliver mine ready stacked (a bit of a nerve killer, but possible with the designs I’ve done and not had an issue (she says touching wood ;) ) ) Internal supports are definitely the most important thing to think about ! As you’re going to be making simply covered tiers then I would transport them in the way YOU feel most comfortable and confident about … You’ve succeeded with 3, you’ll rock the 5 !! Good luck, keep calm, and have faith !! xx
Lou, S.Yorks UK https://www.facebook.com/SugarandSpiceGourmandise