Yep, that's what I read on the NHTSA website about importing vehicles. Every new type of vehicle needs to be crash tested or the maker needs to say (in a letter or such) that it meets the US crash safety requirements. As far as emissions, it's easy if it's a diesel, as requirements are essentially non-existent. In emissions-crazy California, diesels are exempt, while in AZ, you only need 30% opacity in the exhaust. It's the safety stuff that's tougher, which is why a modern LC78 or tropical spec 105 won't be easy to import. I think w /the 105, you could get toyota to say it meets crash tests for all countries (toyota website says they choose the most stringent global standards and match/beat it), but you'd still have to have airbags installed. The gov't might even go as far (in the next few years) to require automatic airbag disable sensors and stuff like that.
The only loophole around this, I think, is to import a truck for commercial use. I mean a real truck, like a Toyota Dyna or something. A LC78 flatbed might be able to pass as a commercial vehicle.