Mike,
I have a small K'archer Pressure washer (1400/1700PSI) 120V Electric type, and I have exactly the setup you describe. /w3tcompact/icons/cool.gif I bought the pressure washer, then ordered a "suction hose" from K'archer direct. It's just a short (about 10 feet as I recall) hose with a small inlet filter to keep you from sucking up frogs, catfish, etc... /w3tcompact/icons/blush.gif
For what it's worth, I use it frequently on my tractor. The standard nozzle is selectable (just turn the nozzle 1/4 turn) for high/low pressure. I think the low pressure is less than 350PSI, the high pressure is 1400PSI. I find that I don't blow water through seals, cause I've always got the low pressure nozzle with me, but when I need to blast some mud, I can do that too. Also for what it's worth, it's not the best unit for doing driveways - you need a higher pressure / higher flow unit for that. But, I bought mine primarily to do the tractor and cars, so the selectable nozzle was a key selling feature to me, and it has more than sufficient pressure & flow for doing that.
HTH, and if you need any further info, just let me know.
Dave Wells