not without a permit
Assuming you are meaning some kind of a travel trailer, the laws would depend on the locality. In many states in the USA, it is legal to build one's own utility trailer, and presumably travel trailers. Licensing requirements would depend on the weight of the trailer, or the gross weight of the trailer and cargo.
There is no legal way to do this without properly installing a UL listed transfer switch. Transfer switches have a mechanical interlock that prevents the utility power and generator power from being connected at the same time. The codes and regulations protect you from having your generator and wiring destroyed, but it also protects the utility workers from injury. The problem is, if a utility worker were to come out and install a meter, not knowing there was a generator hooked up. If there were a power failure, say, because of downed line, and the utility company sent workers out to work on it, they would think the line was dead. Your generator could be backfeeding voltage onto the lines and could conceivably electrocute the worker. There are actual cases of people killed under these exact circumstances. If you need temporary power during remodeling or construction, there are ways to get power, but you need to hire a licensed electrician to do it right and be legal. If you need power because your utility disconnected for nonpayment, they will take a dim view of any jury-rigged arrangement that could jeopardize the safety of their workers. They will take legal action against you, guaranteed. Better to run a separate cord around the house to power the lights and remain isolated from the buildings wiring.
legal requirement
Cloning of animals is legal, but cloning of humans is considered to be a taboo and is not legal.
NO
It is legal to build a nuclear power plant in the U. S., provided the licenses and permits are granted.
are gas powered bicycles legal in California see this doc; http://bit.ly/cZx9kz
Yes, nuclear power plants are legal in the United States. The Nuclear Regulatory Commission (NRC) regulates nuclear power plants to ensure they operate safely and securely. There are currently over 90 commercial nuclear power reactors operating in the US.
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yes it is very legal iam from there
No. It is illegal. Wii points are to be used only from Wii points cards. Any other way of getting them (as by the Wii points generator) is not legal.
Oy! He wants to install a nuclear reactor in his basement. What is the world coming to? (Pardon me. I've been watching Fiddler on the Roof. And yes I know a RTG ain't exactly a reactor. But still...) No, that would not be legal.
There is no free and legal membership generator. Club Penguin is owned by Disney.
Nuclear bombs are illegal since bombs could potentially be harmful to others and places, so no it is not legal.
Yes it is leagal and completely worth it.
For the countries that have them, yes.
No, it is not legal for individuals to own nuclear weapons. Ownership and possession of nuclear weapons are strictly regulated by international treaties and laws.