That got me to thinking: what's different about the contents of this truck vs. a massive helium balloon? In other words, what keeps this truck from flying? (or, for that matter, the helium tank used to blow up the balloons?)
See if you can answer that using a search engine query. Post your answer in Comments and briefly describe your search strategy.
Be careful, the answers you find online don't necessarily agree.
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Obviously, there's a good reason the helium tank or tanker truck doesn't float in mid-air, but the science may not be well--understood by students and this could be an interesting hook to challenge them to search for and evaluate the credibility of an answer.
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