I love the idea of a sign that serves a dual purpose in transport, and custom fit to the truck.
But one thing about sales setups, over many years I learned that the lighter they are to handle, and the faster to set up and take down, the better I like them. You might use the cinder blocks, unload em and reload em after, I'm guessing that would last for the first two markets. After that you'll leave em in the truck.
So best advice, don't design anything in your display around the cinder block, that won't work unless you have it.
