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Another problem with the range-extending trailer, as opposed to an on-board system like the Volt, is that it requires you to always know in advance when you'll need the extra range. Now hereabout roads can be closed due to weather, fires, etc without much advance notice, and alternative routes might easily add 50+ miles to the length of a trip - and that could be 50 miles without services. So if you didn't bring your trailer the day your usual route is closed, you could be SOL.
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