I'm by no means an expert on the Rubicon, but I just completed it a few weekends ago. It's really not a three day trek. Its only a 14 mile trail with two mandatory hard spots. The rest is optional. My group ran the trail from Loon Lake to Rubicon Springs in one day. We left Loon at 8am, got to the Springs at 4pm.
It takes 10 hours to get there from LA.
Here is a proposed itinerary:
Day 1: Drive up, camp at Loon Lake Dam trail head
Day 2: Take the trail to Buck Island Lake and camp for the night.
Day 3: Come down Big Sluice to Rubicon Springs, play in the water, relax, spend the night, or, if you on a schedule, Climb out via Cadillac Hill and head towards Lake Tahoe (a little over 3 hours from Rubicon Springs).
Day 4: Climb out Cadillac Hill. This takes an hour if no one gets stuck or breaks. Then it's another 2.5 hours or so to the west shore of Lake Tahoe along a dirt road.
I trailered my rig up to Ice House resort on day 1, we ran the whole trail in one day, camped at Rubicon Springs, spent the next day doing nothing but playing on the rope swing and floating in the water. Day 3 morning we headed up and out to Lake Tahoe, then all the way back on the 50 to Ice House Road and collected our rigs. We left Rubicon Springs at 7am, made it to Ice House at noon. Beautiful drive along south Lake Tahoe! Then it's the 10 hour drive back home from Ice House again. So you are driving from 7am to 10pm non-stop pretty much, but its not too bad.
Photos:
www.nwoods.smugmug.com/gallery/8991992_QzZZ4#597825014_G9uM3
Old sluice is one optional +5 run, very difficult. We didn't do it. Little Sluice is not passable in anything short of a buggy. Big Sluice is mandatory, and pretty hard, but it's all down hill so gravity will help, even if your sheet metal and driveshafts protest. Cadillac is hard. Steep, narrow shelf road, lots of rocks, with a minor stream running down, just enough to keep your tires wet and a bit muddy. A Jeep on 33" tires, unlocked, pulling a trailer made it up, but he used his winch several times.