I like my translucent 4.9 IMS. Fits well and I can see how fast I'm sucking the fuel, do mental calculations if needed, and slow down or keep shoveling the coal to her. Finally, I have a real fuel gauge.

A stock 49 State tank is 3.4 (CA is 3.2). So, a 4 gal would give you an additional 20-30 miles - not that much more.
Hell, if San Fran and El Arco were out, you're gonna be doing some praying between Bay of LA and Vizcaino.

I figure the 4.9 gives me a solid 200+ miles unless I'm romping on it. That Aqualine is dear, but I'd like to have one.

I'd also like to try some larger foot pegs.

I still haven't solved my hand guard problem. I just hate buying stuff until I'm fairly certain that it's the ticket for me.

Am I typing 'I' enough?

I bought the AeroStich wrap-on heated grip thingies. They take a couple of minutes to put on...and really work. No problems losing heat thru bars and grips. But they are another thing to store when not being used....

Lots of guys are going the Spitfire and Nat'l Cycle wind screen route. My Prabellum is huge compared to those - a barn door.

Also wired (w/fuse) a cheap marine 12v outlet to the battery and mounted it under the BBQ. The inexpensive Airman plugs in quick, and I can recharge batts for cams while on the road.

Personally, I think the CO2 route makes no sense for touring as they have to be replenished - 1 time use. Donde es el paintball gun llanta? Did you ever use one and then later realise that you left the valve core out? I must have aired up other guys tires 6 or 7 times when in CC a few weeks ago using the cheap Airman, with a gauge (mine is accurate). A backup bike pump makes survival sense, but that's a lot of work and won't seat a tire bead. Also, the air pumps weigh next to nothing. A better survival pump might be a spare air pump with the guts removed from the housing... There's 12v on any '68 Ford passing by.

I like your search-for-storage, and I need to find my own system. :thumb
Those are gonna be hot tar arns.
Personalizing a new bike isn't always a quicky, but is kinda fun.