If you can tip it on it's back, then you can tip it on it's side just as easily, as long as everything's secure. The cab I have was transported to me on it's back because it has wheels on the bottom of the backside. Made it a lot easier to pull out of the back of a pickup and if the back got scratched, big deal because the back is up against a wall now. But if it's easier for you to transport on it's side, then it's just like anything else you would want to transport.
Make sure nothing will slide into it, make sure everything inside is secure, and make sure that nothing underneath is going to scratch up the side. Above all, make sure it's secured to whatever you're transporting it in.