Greg's right: putting the vent in the trunk is a concern. If one can find a way to properly vent the tank and keep the plumbing on the outside of the car, that's always preferable.
However, on some cars, there's just no way to do that unless you live with leaking gas caps or a vent directly open to the atmosphere, and that has safety (not to mention environmental) issues too.
I would also observe that typical pressures within the vent plumbing rarely goes above 2 psi, and is usually at zero psi. Using quality plumbing rated at 100+ psi, plus doing consistent leak checks can mitigate that risk.
Doing it this way isn't as good as keeping it all outside the vehicle, but it's better than dumping gas on the ground during typical driving.
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