I had a full size Blazer on LPG and wasn't really that happy with it. LPG is cheaper than gasoline, but has a lower energy content. This means that your mileage will go down compared to gas. LPG is a little inconvenient; to get good range, you need very large tanks. LPG is not available everywhere, is always 'full-serve', and is generally not available 'after hours. The range on my Blazer was terrible. Overall, you may save a bit on LPG, but IMO, its not worth it for a tow vehicle.
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