http://cakesdecor.com/cakes/16245

This is a picture of the sliced standing tire cake I would like to make for Icing Smiles.  I am concern about how this baby stands!!    Any advise?  It appears that there is a cake board in the back, and it may be covered in ganache.  What would be your advise from keeping this from becoming a major cake wreck.  Thanks for your help in advance. 

You can't really see the bottom of it. I would think they just cut the bottom so that it was flat. You could also use the cardboard behind it with dowels to be kind of like an easel to hold it up.