Thanks. Yeah, the FR1612 is basically the 1604 without all the hoses, pump handles, filters, etc.

I'm currently looking at the Redline Pump series.

http://www.redlinepumps.com/heavyduty12voltpumps.html

They're a little pricey at $600 and up, but they're beasts. I've actually heard of a guy using the just the Redline pump and hooked it up to a 5HP Briggs & Stratton engine. That would be a little difficult to move around, unless you left the whole contraption on the truck or trailer.