Everything in my "kit" has been mentioned. But the second part of your comment is priority. KNOW HOW TO USE YOUR EQUIPMENT. Especially a Hi Lift Jack....99% of people have no business touching one of those. Same with Tire Chains.Recovery gear- winch, Shovel, straps, shackles, chain, ratchet straps, hilift.
Regular kit- fluids, tools, axe, chainsaw, tarp, line.
Stove, food, coffee, dry clothes, muck boots.
Most important- knowledge about how my vehicle works, and how the recovery equipment works. I'm the one who usually gets the call to go recover stuck/broken/crashed vehicles.
^^^ one big thing with a hi lift us keep it oiled and out of the weather. A rusted hi lift is a loaded weapon
+1 on this. I just had an injection pressure sensor go out on a road trip on my 7.3. I had a cheap scanner with me but I had never used it on the diesel. It didn't pick up squat. Luckily, a dealer scanned me for free and it pointed to the IPS.$150 engine scanner, if the check engine light comes on it can tell you if you can expect something catastrophic....or if you need to step out and tighten your gas cap.