Why do villagers in Zhongshan build their own houses without pipeline gas tanks?

Liquefied gas is transported by tanker. Self-built houses refer to houses built on rural collective land. Villagers in Zhongshan don't have pipeline gas tanks because liquefied gas is transported by tankers, including car tankers, train tankers and tanker trucks. Only natural gas is transported by pipeline. Zhongshan City is a prefecture-level city under the jurisdiction of Guangdong Province, China. It is located in the south-central part of the Pearl River Delta. Formerly known as Xiangshan, 1925. In memory of Sun Yat-sen who just died, Xiangshan was renamed Zhongshan.