If we did that good luck to China and Russia on finding them at all among the millions that exist already.
“They should make the missile launcher look exactly like a semi tractor trailer to be hauled anywhere by any semi tractor.”
The communist Chinese have missiles inside standard shipping containers.
Looks like that is just what they did.
They used the MK-41 launcher, already in service, and mounted a Tomahawk missile on it. All you need to do is put sides and a roof on it, to camouflage it as a standard shipping container. We can be reasonably sure they have prepared that.