Its all fun and games til your compressor doesnt start or your pump keeps stalling. For me its a space issue. If you go compressor you should still back it up with a 12v. I have a poly Wilden air pump in the shop that I use for transfer. I will guess it's had about 20,000 gallons of straight sh run through it without a glitch.
I wasn't trying to open up a debate about whether 12V or AODD pumps are better. I own both and have cleaned many roofs with both. As Ed said, they both have their +'s & -'s especially when you have employees out in the field.
For the purposes of this rig, I want the 12V set up. That is what is currently on it now and I want to keep it that way when I transfer it to the new set up.
Ed, I have a 2gpm pump sitting in a box as a spare. Maybe I will just plumb two pumps in and stick with the fatboy. Maybe I'll look into the Fatboy with the internal bypass. I'll have to think about it.
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Brian Friel The Roof Cleaners llc Oxford PA 19363 610 842 2104