This may be kind of a long shot but here goes. If you cannot stand it up like normal, like if you are limited on space, what would be the next best way?
I would have to say that transporting a RPTV on its back would be the next best way to do it, if transporting it right-side-up is out of the question. But anything other than right-side-up is risky. If that mirror in there shifts - or worse yet, breaks - you have a big problem, and for that reason on its back is probably the least of all evils. Frankly, the best thing to do is rent/borrow a vehicle that's big enough that you can move it the right way.