"d" == djvanantwerp writes:

d The flight will be in a 2003 C-172 SP. I do not have a
d mountain checkout yet, but am planning to get it in the next
d couple of weeks.

Hmmm. A mickey-mouse mountain "checkout" will simply take you and an
instructor in a high-performing airplane to cruise to Tahoe or Reno at
12,000 to 13,000 feet, do a couple of takeoffs (which are no problem
because of the airplane, weight, and performance) and head back home.

A good checkout would be a somewhat doggy plane loaded to gross with
an instructor who knows what they're doing, and you fly below peaks,
down canyons, and basically get over your natural fear of granite. In
this scenario when you takeoff you want to pull the plane up yourself.
This will teach you to respect the mountains but not be afraid of
them.

d This will be a day VFR flight solo with only
d my 30lb flight bag and a duffel bag of clothes

d Main navigation will be GPS via the KLN94 and MFD in the 172
d with a Garmin 195 as a back-up.

I live in Davis, have an Ercoupe, and have flown from here to
Washington (I5) and Oshkosh (I80), so with your equipment and weight
you'll have no problem. But you don't know that yet...and you know
the only way to know it is to do it. Good thinking.

From (KRBL) to (KRDD) Redding. After that I am not sure about
west or
d east of Shasta. Any input about this?

I fly west, and don't know what's east (don't have my sectional
handy). Here's something important: launch from Reid-Hillview as soon
as you can, daybreak if possible (which might be a problem if there's
an overcast). Avoid the area between Redding and Medford in the
afternoon or at least be careful then of convective stuff.

d Should I carry oxygen for 10,500ft?

No.

Basically it's an easy trip and you'll realize this after you do it.
Keep doing the long ones and you'll build confidence fast. After you
get back from Oregon, consider a trip to Los Angeles or Phoenix (in
the fall--go to the Copperstate fly-in for an excuse).