nwbrewer
Contributor
Ideally I want a rig that allows me to side mount, and then when someone at the beach says they need me for a dive I just put a tank in back and go with out any time for setup, or futzing. I have basically worked out how to make it so the left reg can be moved in an instant from sidemount to single back mount with just a din adaptor. I have to use their yoke tanks for the backmount. (I am considering switching my left reg back to yoke to eliminate the need for the adaptor, but I don't like not being able to swap first stages from left to right, underwater since I have actually need to do that a few times.
Maybe it's the part of the country I'm in, but for me, yolk tanks implies an al80. If that's the case, just move the RH 2nd stage onto the left reg, and use the al80 on the left side of your sidemount rig. It's close enough to neutral that it's no problem to single tank SM an al80.