I got a chance to talk to the p/u owner again and asked him about the power. He said the natural gas was fine for the hauling of regular sized loads but he had to switch to regular gas when he hauled a trailer with several thousand pounds of weight in it from Joplin, Mo. to Hannibal, Mo. There are lots of steep hills on that particular stretch of highway.
There was a p/u equipped with a propane tank that went through one of those small car washes with a brush that washed the truck. The brush knocked the valve of the tank and the explosion leveled the car wash and damaged a lot of homes in the area. That was in the 80's when propane conversions were popular.
One of the reasons the pumping stations for natural gas are so expensive is the cost of the equipment to compress the gas. The pressure has to be a lot higher than the 6 psi required for natural gas in the home.
It loks like it will be awhile before the conversion will be practical for most people.
May the (mass times acceleration) be with you.
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