I am transporting a cake that is 3 hours away...in the Florida heat.    I will have it disassembled.   Do you think I need some sort of Styrofoam coolers to put the cakes in?

Thanks Lori 

I live in Florida and usually transport 2 hours.  I put my cake inside of the car with the A/C on.  I make sure that the car is not hot when I get in.  This means I usually get the A/C going to make sure the car is cool.  I have not had any problem with Buttercream or Fondant.  Do not put it in the trunk of the car.  

there are times when a trunk is a better option -- there's no sun to deal with and in my car i can lay down the back seat so i can circle the air through there -- 

cakes should be climate controlled and protected for delivery -- seal already cold cake into corrugated cardboard boxes -- when extra protection is needed place freezer packs in there or frozen pot pies to keep it extra chill -- control any possibility of condensation and movement -- you can travel for hours and go through traffic tie ups and vehicle changes if necessary -- no worries about the cake --

and it goes without saying almost that all surfaces have to be made level --

k8memphis I agree that we can use the trunk but it needs to be like you mentioned open to the A/C circulating through the trunk.