Interesting point but I think the recent gas main explosion in new york and the fervor over our aging, difficult to inspect and dangerous gas mains (the one in question was 127 years old) needs to weighed if your going to argue safety. [1] Reputable propane fillers will only fill gas tanks that have been recently inspected and even the largest mobil tank only holds a limited amount of gas compared to what can be released when something connected to a main leaks.
However, my point more then being pro food truck or any one business model is that major socio-economic trends like groups of people needing to move away from some cities is indicative of something that might be target by a startup. Who knows, maybe the next big trend is custom manufacturing with same day delivery via 3d printers, skilled laborers and bike messengers leveraging both the concentrated capitol of the educated workers and creating jobs for people who would otherwise have to leave.
However, my point more then being pro food truck or any one business model is that major socio-economic trends like groups of people needing to move away from some cities is indicative of something that might be target by a startup. Who knows, maybe the next big trend is custom manufacturing with same day delivery via 3d printers, skilled laborers and bike messengers leveraging both the concentrated capitol of the educated workers and creating jobs for people who would otherwise have to leave.
[1]: http://www.cnn.com/2014/03/15/us/aging-gas-infrastructure/