Transporting a stacked wedding cake - any advice?

[Anglepoise]

Evening

We're off to a friend's wedding next weekend and I have made the cake, which is a stacked three tier fruit cake. The wedding is about a four or five hour drive away. I have a box with an extender and was going to take it ready-stacked then just attach the sugar flowers once it's in situ, but I've just stacked the tiers on top of each other and they don't feel very stable, so I'm worried about them sliding about en route.

Any suggestions? Not sure whether to (1) get some more boxes and transport all the layers separately, then assemble it when we get there (I think I did this for SIL's wedding the year before last) or (2) try to stick the layers together in some way (icing?).

Very grateful for any advice!

I think I'd go for option one! Much, much safer!

Have you put dowels in it?

option 1, under no circs try option 2, there's no way icing is strong enough to hold the layers together.

Yep, dowels are in.

Seems much less stable than prev cakes I've done - bit worried about it sliding apart when they cut it!

Option 1.

Sounds like option 1 is the winner!

option 1- we did option 2 and it sort of slid and squashed despite being protected in bubble wrap. That was a 2 hour journey.