I was wondering about taking a friend on a long (to her) journey lying on the bed in the back of our 1997 converted ambulance, as she gets very tired and sometimes nauseous sitting upright. Seems that should be legal, and reasonably safe?
Can I ask, why you consider a person laying on a bed in a moving vehicle could be considered safe.
Also, if someone is suffering travel sickness laying down would make it worse.
I suggest stopping every hour of so for a short break and a walk would help matters.