Yes, it needs insulated tanks that will keep it from getting warm before it's used. In a dual-fuel vehicle (like UPS's LNG trucks), you fill up with not more than the amount of LNG you expect to use in the next few hours, and then when it's done you use gasoline/diesel. With commercial vehicles, you have a good idea of how much fuel you will use that day, and can fill up accordingly.
Only for a defined time, before you have to vent or use. Insulation is not refrigeration. The heat is flowing in, but at a reduced rate.
What is done with Vehicle tanks is that tank is also built to contain a build up of pressure as the boil off occurs within the tank.
It will continue and build in pressure. In the US and Canada, vehicle LNG tanks must be able to contain the vapor build up of pressure for 5 days. Past that point, it is going to vent; either into a recovery system or into the atmosphere via a safety pressure valve.
What is Boil-off?
http://www.unece.org/fileadmin/DAM/trans/doc/2011/wp29grpe/LNG_TF-02-06e.pdf
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