The In Reach is great as it works just as well as an ACR for the true emergencies, but also works for the inconveniences - need a CV joint delivery, need spare fuel, gonna be a few days late but don't call the cavalry. The key thing is to have a reliable person who you can send those non-emergency messages to who will act appropriately.
We also use the tracking feature on our inReach (both for hiking and driving). This is fun as we now have a map of all our adventures, but we also have the assurance that if we ever had a truly cataclysmic event where we can't even push the SOS button, there is a record of where we were within the last 10 minutes, so they at least know where to find our bodies.
As for other items, a first aid kit is essential, but the training on how to use it is equally important. As AWG points out, the little stuff happens much more often than the big stuff, so either plan on restocking the first aid kit regularly or keep a second medicine kit that has the stuff you actually plan on using such as ibuprofen/bandaids/blister stuff.
Traction boards are probably the best 'unstuck' option, they are lighter and cheaper than a winch, and still work when there isn't a convenient tree (much of the time in the west).
Tools and spares are tricky as if you want to carry enough for every situation, it gets heavy quickly. I carry enough tools for the minor issues - a Robertson screw driver to tighten screws in the FWC a set of sockets in the JIS sizes only for the truck, a multimeter and a few electrical tools for a frayed/broken wire, but not a huge kit for major repairs, as I wouldn't have the parts anyway. A compressor and tire plug kit is also great - you will likely use the compressor to air down and for airbags anyway.
