Nitrous bottle question

Their deal is you buy the bottle then trade it out for refills. They said they can get nitrous oxide, so I was wondering if there is any reason I couldnt buy a smaller bottle like the 22 or 40 cubic feet ones in the picture and set it up to run in my car. That way I could just trade the bottle out locally instead of having to drive 40 miles away to get my normal bottle filled, and I didnt get prices but I bet it would end up being cheaper.
There any reason this wouldnt work?
Edit- Thinking about it more...is the problem that these type of bottles draw gas off the top instead of liquid off the bottom of the tank?
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