How do u suggest transporting 800 cupcakes? 

Do you have a place you can buy boxes with cupcake holders??

I have cake boxes and plastic dozen holders

With boxes, you would need like 32 of them if each held 24 cupcakes. For my large orders, I use the Rubbermaid containers, the flat long ones. With my last order, I was able to fit 86 in each. 

Oh! Great idea!

And they interlock each other so I was able to stack them in my Jeep and carry 2 at a time. They worked out perfect! 

I would cut my cardboard inserts to fit snugly inside the plastic box to prevent any toppling.

They fit so close together that they didn't topple....for me anyway.

8 Full sheet boxes or you could find something corrugated to work at uline.com

Wow, 800 cupcakes!  All I can tell you is I use 1/2 sheet bakery boxes with a cake board on the bottom for stability and cover that with some paper towels.  Each box should hold 30-35 cupcakes.  I hope you're considering baking all of these ahead of time and freezing.  That's what I do and put them in ziplock bags. Then when it's time to frost them, they get placed in the box while still frozen and the frosting is piped on.  It would be a nightmare to handle each one separately for frosting them unless you're doing a special design.  Good luck.