A 50lb bag is a 50lbs, regardless of whether it contains rebreather tanks or that stuff our spouses acquire every time they travel. I don't for a moment think this is financially motivated.
we have traveled with our RB's to Grand Cayman via MIA. We took the tanks off and had cover that fits over the rEvo and carried them on like back packs. I got stopped multiple times throughout security and asked to take the cover off, the scrubber cover off, the scrubber cassettes out so they could see inside the RB. But they let me thru. Put it in the overhead compartment, no prob. We didn't take tanks or sorb so cant advise there.
we also had can lights and video lights, we printed all the data sheets on the lights as well as the current TSA regs on lights but never got questioned on the lights.
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