Thanks for the questions, esshup. Not yet sure how far away from the pond the garden will be, but likely not more than 150 feet or so. The elevation change between pond surface and garden surface won't exceed 5 feet in all likelihood - the pond is in a fairly flat area and the garden will be located in that same general area.
I do have a generator and I do have a midsize-ish ATV that would probably pull a 275 gallon tote without too much difficulty. Hadn't even thought about that idea, but could just get one of those, and aren't they self-powered with gas?
Thanks - look forward to your further input.