Just a thought: I watched an interesting Youtube video last night where a guy was discussing how even the slightest level issue (side to side) of his rig dramatically effected how much water his tanks would hold. I've noticed that my tanks are wide and shallow, so I can see that this could be an issue for me as well. He mentioned measuring about a 15 - 20% apparent decrease in his tank capacities! He now parks his rig on boards on the fill side when filling and on the drain side when draining (to help gravity).
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