Nope, so long as you have tail lights, brake lights, turn signals, and reverse lights.
Don't forget mud flaps behind your rear wheels. And you MAY have to have a bumper or "ICC bar" to protect from a rear end accident. ( it keeps a vehicle in a rear end accident from driving under your truck)
No, it is illegal to ride in the bed of a truck in Missouri, because riding on the exterior of the vehicle (which includes the bed of the truck) is illegal.
It is technically illegal to drive with your tailgate down in Tennessee. This is considered to be an unsecured load, even if there is nothing in the bed of the truck. This is only considered a violation.
yes
it depends on your age/
in WA it is illegal to ride in a truck bed at any age. You must have setbelts
Yes
It's illegal to drive (or keep a motor vehicle) on UK roads without valid tax, MOT and insurance, so bring the car back on a flat bed truck or similar and store it off road.
The state of Minnesota currently has no restrictions on riding in a truck bed. No one should ride in a truck bed without a proper restraining device to prevent falling out.
It is incredibly illegal. So If you were dared, DO NOT UNDER ANY CIRCUMSTANCES DO THIS!!
As long as it is secure and contained within the bed of the truck.
No way to answer this without knowing the dimensions of the truck bed. For all we know, you could be talking about a small pickup or a large dump/tipper truck.
To the best of my knowledge most 2 wheel rear drive cars and trucks can be towed without damaging the transmission (if by your question you mean "flat towed" as meaning towed behind a tow truck on it's rear wheels). Most, if not all, 4 wheel drive cars need to be towed ( carried up on) a flat bed truck. Having a flat bed truck carry a 4 wheel drive car will prevent damage to the transmission.