If you're towing, the rubicon is kinda annoying (unless you have plates and a semi-streatable rig)
If you're running trails in that order, I'd:
go to Cisco Grove Campground off I-80 at Cisco Grove exit, leave tow rigs there. (make sure to pay for the space - it prevents people from vandalizing your tow rigs)
street the rigs 1 exit down to Eagle Lakes Road.
I'd jump on fordyce and wheel up a ways, then camp. Then head up and run winch hill 3 (the one with the v-notch) and then turn around, and run out at the comitte crossing, and take the fire roads back to the tow rigs.
From there, Id tow / drive into south lake tahoe (go up thru truckee and around the lake for a nice dusk drive) and get a hotel and a shower in south lake.
the next morning, Id go into the 'con from the tahoe side (down cadalac and up big sluice) and camp at buck island lake.
I'd spend a day enjoying the lake, and the absence of people (because its a week day).
Id head out through loon lake side, and either drive the rigs back to south lake, or have someone give me a ride to my tow rig, then do the hotel and shower thing again.
In the morning, I'd head to Barret Lake (Off I-50 between South Lake Tahoe and Ice House Road).
Head into barret, camp at the lake.
Stay the next day (friday)?
Head out on saturday, and get a hotel / shower somewhere, and spend sunday driving home...
A few notes on the Rubicon Trail and Barret Lake trails -
Both of these trails are 'pack it in, pack it out' trails - meaning garbage, poop, beer cans, shotgun shells, and leaked oil all needs to be taken out with you.
Both of these trails lie in ElDorado National Forest - and are subject to a 100? foot rule - meaning that you can never be more than 50 feet from the centerline of the defined trail - this makes the 'between the trees' little sluice bypass ilegal, as well as camping at the shoreline of most any lake.
While you can camp at Spider Lake, there is a no-vehicle policy, meaning that you would have to leave the vehicle down the hill where the 'no vehicles beyond this point' sign is - out of sight. I've never been comfortable with that.
both Tahoe National Forest (TNF) and ElDorado National Forest have imposed different fire restrictions in the past, and as a responsible wheeler, I'd encourage you to be knowledgeable about these before heading out.
Propane based campfires are sometimes legal, and a good way to go.
In 2007, TNF closed the entire forest to vehicle trafic - including fordyce, citing some fire danger... 2008 saw the closure due to wet conditions for a long time... I dont know what 2009 will hold...
Check
http://www.fordycetrail.org/ and
http://www.friendsofeldorado.com/ for more info on the trails and the groups that fight to keep them open.