I solo mostly in Nevada in the BLM lands. I love being able to set my own schedule, not feeling guilty about getting started late or stopping early if I'm tired. Plus the wife and kids have no desire to go so... I have an Inreach JIC, winch, tracks, recovery gear, lots of water, tools, etc. I'd like to have a portable welder too but the specialty ones are expensive and you need a couple of batteries so not sure about that in the future. I used to go in my lightly armored '15 Grand Cherokee but I just finished (never really finished) building a '99 Cherokee which will be my main OL vehicle now. Always have paper maps in case you need to walk out and as much water as you can reasonable carry. I always assume I may have to self rescue or walk out of a bad situation so I plan accordingly. Oh and for food I usually just bring a bunch of MREs. I can eat them cold if I don't feel like breaking out a stove or if I just want to eat in the car by the side of the trail. I'm not big on the gourmet cooking outdoors so those are fine for me.
I really don't like bears so I usually stay East and South of the Sierras. I do always take a firearm but mainly for the 2 legged predators more than anything. For sleeping I really like the Aussie swag bag on a cot. They're basically single man tents made of waterproof canvas. These are great for camping out of a vehicle because you can leave your sleeping bad, pad, pillow, etc. in the swag, roll the whole thing up and throw it in the back of your rig. They're warm, dry, quick to assemble and convenient. Another advantage to solo overlanding is you have a lot less crap in your rig which is always a good thing.