Do you have some backup spares that you maintain, a breakdown bugout bag, I am not talking about air filters, oil filters etc, the more "exotic" stuff that tends to have a limited life span, eg: camshaft position sensor

 

Camshaft and crankshaft sensors both by Bosch and’s a RCM (relay control module).
Don’t leave home without them.
Just keep an eye on the other wear items like the engine serpentine belt etc.
You do not want to spend money on too many parts to drive around.

 

I'm with Dave here, but I did once wish I'd had a spare belt. I got stranded at the Eureka meet when, just outside Branson, my belt shredded.

Today, I carry a crank sensor, RCM and belt. Along with a 1/4" drive E-Torx socket set, six screwdrivers, pliers, metric socket set (5.5 to 15mm), clip leads, DMM, code reader, vise grips, adjustable wrench, sharp knife, wrap-ties, assorted spare fuses (in addition to the spare fuses in the main fuse box) tail-turn-headlight spare bulbs, detail supplies, paper towels, window cleaner, 91% alcohol and convertible top tool.

 

Like Dave & Mark have stated above, whenever I take a long trip I carry spare crankshaft & camshaft position sensors and the tooling (E-Torx small set of 4-5 1/4" drive sockets) needed to access them (including spare SHCSs - bought 4 from a website some time back in case I drop the one that secures the Crankshaft Position Sensor - it can be hell removing it when the engine is hot). I include a 6" long 1/4" drive flex shaft to use with a 1/4" drive socket wrench to get at the Crankshaft Position Sensor. That also means I have a spare set of Mechanix Gloves if I have to work on the engine when it's hot or even warm. I also carry a spare RCM when I travel & now add a serpentine belt (I was part of the group that was with Mark when his belt shredded in Eureka Springs). (Note: I inspect the serpentine belt probably every 2-3 months for any signs of stress cracking from wear/fatigue. After all, I still have the OEM belt on my 2007 Coupe, but the car only has been driven 31k miles.) I put a 100 piece or so tool kit that has most everything I need in the hatch. One that comes in a flat case so it doesn't take up much room - I think I bought it at the local Sears store way back when. Everybody carries a version of these kits - Lowe's, Home Depot, Harbor Freight, etc.. I also have a BlueDriver Bluetooth Professional OBDII Scan Tool in the console bin that I can use to troubleshoot an issue. The BlueDriver App is installed on both my cell phone & tablet. (Note: BlueDriver OBDII & Cell Phone App are with me at all times in Crossfire. I can always troubleshoot to see what's causing my issue, even near home.) I do have a really good battery tester (small handheld) that I sometime throw in when going to a driving event GTG. Never know when anyone might need to check the car battery as the cause of a 'no start' condition. And I have the MicroPod2 in the console bin & DRB3 Emulator software on a small laptop to reset & clear any TPMS faults if a fellow Crossfire Owner gets new wheel sensors installed and wants the re-learn process performed to clear the dashboard warning light. I use a good Autel scanner tool to activate the wheel sensors during this procedure. (Note: The wheel magnet isn't needed to do this.) The Autel TPMS scanner also enables me to go around a Crossfire & check wheel sensors to pinpoint which one is triggering the warning light.

Isn't any room for anything else! Gotta take the wife & her luggage, too! That's why I drive a Coupe!

I had all these parts & tooling with me when I attended the Fall Crossfire Rally in Kingsport, TN a few weeks back. Didn't take the DRB3 Emulator software & Autel scanner with me as I didn't know of anyone needing this diagnostic work done. But I didn't ask ahead either if anyone needed this! Had a 'senior moment'!