From the little experience I have with wedding cakes when it comes to delivery you need to give yourself more than enough time to get to the destination and with time to spare,many things can happen you can get lost,there could be something you need to fix on the cake as you set up so you need time.
When it comes to transporting larger cakes,it is good to keep in mind the design of the cake.A simple stacked cake with few decorations will transport without problems as long as it is dowelled/secured .Other designs though will require for example that each tier is transported separately.Cakes with intricate decorations for example flowers,sugar work may require that you transport the decorations separately and attach on sight.
Always travel with an emergency kit.It should have among other things extra decorations in case of breakage,any kind of sugar glue for attaching/fixing,brushes,glitter powder and anything else you may need depending on the cake.
There is a Forum Topic here on CakesDecor about what to do when there is no one to sign for a cake on delivery,do read that for more tips,It suggests taking a photo of the cake after set up. It is evidence of delivery of your work incase anything goes wrong.
I know it may sound daunting and a bit much to consider but surely with the care you are taking to prepare for the cakes, it will be alright.All the best
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