You can always get a really lightweight rig (rather than, for example, a BP/W rig with a stainless steel plate), use that to get your tank down to the water's edge, and carry your weights separately, then put the weights on your rig right there next to the water.
You could even carry your regs separately and put them on right at the water's edge as well. It might take you a couple or three trips between the car and the water, but it would minimize the weight you have to carry on each trip.
My BP/W rig is about 11#. That's a 5# BP, but with the webbing, D-rings, buckle, tank and crotch straps, the final weight is about 11. So, that plus the weight of a tank (38-ish?) and then any actual lead required.
if you are going to put your whole rig together, including any required lead, before you walk from the car to the water, then you should consider getting/using HP steel tanks. E.g. an HP80. The tank itself will be a little heavier, but the reduction in lead that you will need will result in a lighter overall rig.
You could even carry your regs separately and put them on right at the water's edge as well. It might take you a couple or three trips between the car and the water, but it would minimize the weight you have to carry on each trip.
My BP/W rig is about 11#. That's a 5# BP, but with the webbing, D-rings, buckle, tank and crotch straps, the final weight is about 11. So, that plus the weight of a tank (38-ish?) and then any actual lead required.
if you are going to put your whole rig together, including any required lead, before you walk from the car to the water, then you should consider getting/using HP steel tanks. E.g. an HP80. The tank itself will be a little heavier, but the reduction in lead that you will need will result in a lighter overall rig.