Chuck,
On my boat we secure the tanks with BCDs assembled for the entire trip. Roll control brackets work fine with BCD on or off. I should also note the brackets have little to no space between them in the AL track. For doubles we use two brackets and tie the tanks in using the two outermost brackets. Even with integrated weights, BCD, canister lights, etc, the brackets work fine in all conditions.
The normal Roll Control brackets work with a BC on (provided the
strap around the tank isn't in just the wrong place, but the #430
is new (since the last time I was on the RC website) and it goes
all the way around the tank, so I think it would be problematic
with a BC on.
The channel can be mounted directly to the boat provided that
the boat is flat as a board at that point and that the surface it's
mounted to is vertical enough that the tank can stand on the
deck. In my case I had to mount the channel about two and a
half inches out from the console so the tanks could stand. I
fabricated the mounts from aluminum stock from OSH (that's our
local HW store chain for the non-Californians.
I MIGHT one of the
mounting kits that you (rrweather) can have (free). I'm in Morgan
Hill if we can figure out how to get it to you. I won't be able
to check until tomorrow morning.