Appreciate the suggestions on what to have, as I run the list I think I have most of these already. My 4Runner is new (2020) and a stock build, so shouldn't need too much in way of maint (I hope).
I have:
Radio comms (ham & GMRS licensed), a full-size spare, recovery point rear, 30' tow-strap with looped ends, and the 4WD vehicle, GAIA GPS downloaded on iPad mini & iPhone.
Questions:
Do you recommend extra fuel can?
Do you recommend a Garmin inReach?
What about Maxtrax (or similar)?
-HAM is great idea and for the most part easy to get. The license is a barrier to entry, but not an insurmountable one.
-Full size spare is a must...so either keep tire sizes close enough to stock to run a spare in stock location or commit to a swing-out carrier. Bonus is the swingout gives you some room for more fuel (mandatory IMHO) and to carry traction pads (mandatory) and many a neeato coffee/kitchen table (or cocktail preparation station...just sayin').
-I run an InReach and have since they first came out. Prior to that, we used PLB...I am USMC, swift water rescue, wilderness first responder, etc...and I have used a satellite communicator on more than one occasion. I think the InReach is the best consumer-grade product out there as I can send non-emergency messages as needed and folks that care can follow along with my travels easily. I have folks that watch for my progress and know what to do if my progress seems suspect and they have not heard from me. In Colorado and other states on the TAT or other trails you are gonna be WAY away from cell service and HAM repeaters and if you need help or just want someone to find you a NAPA or whatever, the InReach is a great way to do so. Get one, pick the right service plan for your needs and you will find yourself carrying it more than thought you would.
-Extra fuel is a must in my book.
-I run traction pads 80% of the time...I have only used them a few times in my life, likely could have gotten by without them, but I have loaned to them to folks on the trail or friends that used them way more than I. If you have room, take them, if not make room, if you can't make room then hope you don't need them.
-Tow strap AND a snatch strap...those are two different things that perform two different tasks. They can be used in conjunction. But get both. They are small enough and worth their weight. Get a couple of hard U-type shackles...but also get a couple of soft shackles too...much safer in almost all scenarios.
-I am sure you will have the first aid bit covered.
-Why not take a small camping water filter...just in case.
-Tools...take what you need. Do some repairs before you go, including a serpentine belt change and basic maintenance, and put those tools in your tool bag. Along with some wire and some bailing wire and some electrical pliers and Scotch Locks and fuses.
-Tire plug kit...don't worry about tire tools and patches for this trip unless you have the means to perform those repairs...not easy nor fun. You should be fine with just a plug kit.
-A GOOD bottle jack. Hilift jacks are cool, but there are times you need to get a wheel off, and a Hilift just won't work. I use Safe Jack bottle jack and I think they are smaller, lighter, and safer than a Hilift.
-A good compressor.
The list can go on...but this is basic stuff I carry 100% of the time in my vehicle (along with cold/wet gear and emergency sleeping stuff and dop kit). I can safely cross the country in remote areas equipped like this. It seems like a lot of stuff, but almost all of it can fit in a small tote, it is all quality stuff that will serve you well for years, and even if you never use any of it...it'd be better have it and not need it.
I will be following your dream trip, as it is one of mine, and it'd cool to meet up as you progress to the western states.