The weight of an explosive does not directly correlate with the energy or destructive impact of an explosion, it can depend upon many other factors such as containment, proximity, preheating, purity and external oxygenation (in the case of gas leaks and BLEVEs).
BLEVE is an acronym for Boiling Liquid Expanding Vapour Explosion.
In the case of this super b full of propane that would not be a good thing, even if the rig is miles from any inhabited area.
This roll over near Rimby took Big Rig Towing an entire day to offload its cargo of propane before it was safe to right the rig and get it back on the road.
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