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I'd be quite concerned over that much water shifting around while driving. A higher center-of-gravity for the truck should take precedence in this. I don't see it being free heat as the truck still has to accelerate that non-paying mass/weight to speed and back down again. A one-two punch.
A propane garage heater would be more cost effective given proper installation.
Decreasing the service life of the vehicle and components plus higher fuel cost plus handling/steering deterioration is expensive on several levels.
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