A friend of mine moved her 15 month old to a bed after he tried to wriggle out of her cot. She got both her legs stuck and my friend had to call her brother (her DH does FIFO) over so he could saw the cot apart to free her little legs
She has adjusted to a bed fine. It's a normal single bed and she has just attached a rail to one side (one of those mesh ones) and the other is pushed against a wall.