I am having last minute jitters. I have booked a "naked" cake with a bride due next month. She has requested fruit filling with icing. I know that fruit is slippery and can cause cake slides when driving. The venue is 45 minutes away at max. Any driving suggestions? Would it be better to keep each tier wrapped to prevent drying out and then assemble at the venue and then unwrap? Thanks in advance.  

On site assembly would be the safest, but may be you could assemble then wrap each tier in plastic tightly. That may work, I am honestly brainstorming. May be someone has actually done this...

"A naked" Cake?   What's up with that.  They could have cupcakes if they don't want huge amounts of icing. That's like asking a professional Wedding dress seamstress to make a petticoat to wear down the isle.

there are a few hints if you read through here as far as keeping the cake from drying. http://cakecentral.com/t/761226/have-they-really-finally-found-a-way-to-lower-a-price-of-a-wedding-cake

I wrap each layer in cling wrap, then on site use a very thick warm simple syrup, and spray or brush it on the exposed cake. I use it warm because once it cools it's too thickly to nicely spread.

Another poster mentioned she uses piping gel.

I never assemble on site, unless it's a massive cake, but if you are feeling uneasy, do whatever you are most comfortable with.

In general, cupcakes have a higher frosting to cake ratio than a slice of cake does.

And actually, a well made naked cake is harder to execute than a basic iced or fondant covered cake, imo. There is nothing to hide behind, so everything has to be perfect.