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The electric bike kit I bought nearly 20 years ago had a battery you could swap and nearly every kit I've seen along with half the ready to ride electric bikes come with batteries you can swap, it's not a new idea at all.
As for putting all of your batteries in a trailer on a car... you'd end up with a very light car and a very heavy trailer so handling becomes an issue, you also have to drive around with a trailer all of the time so you limit where you can park and most of the time the average person only uses half the full range of an EV.
I have thought about a battery trailer for longer trips to extend my range but either borrowing a gas vehicle or using my current 50mpg gas vehicle seems to work just fine for those longer trips.
In tests that I've read about, putting an identical battery pack in a trailer will increase range by 80%.
I'm kind of hoping that at some point someone makes a pusher trailer out of the front end of a Prius and plugs it in to the EV's battery pack.
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