Before purchasing the Transfer Flow tank for my duallie, I also looked into Aero.
I didn'y like the looks of the Aero to begin with, but more than that, with the Aero you will have to switch tanks manually. The advantage of the TF is that a computer keeps the volume balanced between the Main tank and the auxilliary tank. A tank-mounted fuel pump does all the transfers, and you can simply forget about messing with levers or overfilling.
This is how the TF system works:
Lets say you have your 54 gallon auxilliary tank installed. Your very nice, easily readable, lighted, dash-mounted readout will read 88 gallons when full, and will show you 34 gallons in the main, 54 gallons in the TF unit.
As you're driving along, the TF computer will allow the main tank to get to 26 gallons, and then begin pumping fuel from the 54 gal tank until the main tank gets to about 30-32 gallons.
Thereafter, the computer will keep pumping from the 54 gallon unit periodically to keep the main tank filled to the 32 gallon mark. When the 54 gallon tank gets down to 32 gallons, the computer will then pump fuel to keep both tanks at the same level, so that they both go down with the same amount of fuel in each tank.
The dash-mounted readout is -extremely- accurate. If it says you can put 15 gallons in the main tank, you won't get 16
The computer also modifies the dash mounted analog gas guage (the OEM unit) so that it reads the total percentage of a combined fuel load between both tanks.
So if you have 22 gallons in each tank, your analog guage will read 1/2.
It's more expensive than the Aero, but the quality of workmanship is flawless, and with nothing at all to mess with, it was well worth the extra bucks. You won't be dissappointed.
Have fun,
Robert
