Well, I am making my friends grooms cake in June and she wants just a sheet cake with one layer of rasberry filling, covered in Chocolate CB then covered with Chocolate Ganache. Im fine ?with all of that but it is for a lot of people 100+ Ive heard of putting two cakes together but how will I get it to the wedding. Is there cake boards that long? What size pan should I use
You could do two 12x18's side by side. The grocery stores sell the boards and boxes that big the ones here sell them as either gold or silver covered very sturdy almost solid like wood boards. You could slap them together side by side and ice as one or leave a gap in between and ice as two. If you choose to ice as one cake make sure you "glue" the cakes together with some icing as well as "glue" them to the board with some icing. I would go to the grocery store bakery and ask for a full sheet cake BOX and BOARD be very specific lol. The one I purchased barely fit into my car (Honda Accord 4 door). Hubby had to hold it on the way to the party and I barely had room between the box and the steering wheel to manuver lol. So you'll know which box is a full sheet even if they don't it's humongous!
If you plan to fill these cakes with a filling as you stated above I would suggest making two cakes per cake. Meaning make one cake about half the thickness as you would normally to be one layer and the second one the same size to be the second layer. I would also measure the batter as you put it in the pans as well as take a plastic ruler and stand it in the pan once full to amount needed and make sure they are all 4 the same size layers so that when you put them side by side as one big long cake they are the same height. I hope that made sense. Basically what I'm saying incase it didn't come out right is instead of trying to layer a large cake bake two smaller thinner cakes as each layer instead of torting or possibly breaking them since they are so large. Don't forget your dam of icing for your filling 
.... Oh yeah and if you plan to make them all one long cake, I'd suggest trimming just a touch off the ends that meet in the middle so that there aren't any "finished" edges inside the cake incase it isn't sliced properly so that the joint isn't a slice it self 
Hope all this makes sense
No problem hun Sheet cakes are my specialty I guess lol seeing as that's basically all people order lol Good luck with it and feel free to PM me if you need anymore help.
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