AI'm making a camo wedding cake and they have an actual tree trunk as the base. How can I secure the cake to the base? Or what can I put the cake on and then transfer it onto the base?

You have to put your cake on cardboard cake round, is the top of the wood even and smooth?  You could use a double sided tape...

AYes, it's even and treated. Double stick tape is a great idea.

Thank you so much!

Good luck!!