Based on your own situation and the purpose of your self-driving tour, I have the following suggestions.

If you want to enjoy this journey quietly by yourself, I suggest you buy an RV. Of course, you can choose RVs of different prices according to your budget.

You can choose this if you are not short of money. First of all, RVs are larger in size. The chassis of an RV is generally a non-load-bearing body structure such as a truck or a pickup truck. It has a high ground clearance and is more passable in the wild. It has a large fuel tank, long battery life, and may also have a spare.

The fuel tank can further enhance the vehicle's battery life, ensuring that the vehicle can still keep moving when there is no gas station for a long time, and you no longer have to worry about the next gas station being too far away.

In addition, the RV can also bring its own water tank to solve the problem of domestic water during the trip, which can be used to wash your face, brush your teeth, and even take a shower.

Secondly, an RV is like a mobile home, which can contain almost all the items we need in daily life, including bedrooms, bathrooms, kitchens, and even home theaters.

The RV has a large loading capacity, so you can bring a lot of things you want to bring.

The RV bedroom allows you to have enough time to enjoy the journey on the road, and you don’t have to rush to the next accommodation point and miss the scenery on the road.

If you like a place, stay there for a while.

You don’t have to worry about whether the hotels on the road are hygienic or not.

The bathroom in the RV can solve the problem of inconvenience in going to the toilet in the wild, and it is also beneficial to your own personal safety.

Some RVs have kitchens, and you can even cook a delicious meal for yourself during the trip. It feels very picturesque just thinking about it.

Some RVs are also equipped with solar power generation equipment, which can provide electricity for the living facilities on the vehicle. Maybe you can also watch movies at night.

If you want to meet by chance on the road, or get to know more people, go on the road with everyone? Pick up people? Or form a convoy with strangers.

If you take the conventional route, in fact, most cars can meet the requirements. The Sichuan-Tibet route has been well repaired now. Daily urban off-road vehicles (SUVs are enough), and many cars with not particularly low chassis can also be used.

It is recommended not to drive a car with a low chassis like a sports car.

Of course, SUV models are better, and there are more SUV models to choose from. Today's cars are no longer like the previous cars. You can still guarantee that there will be no faults if you drive on the Sichuan-Tibet line, even Chery QQ.

In order to save worry, I still recommend buying those joint venture SUVs with relatively large sales volume.

Such as Nissan X-Trail, Volkswagen Tiguan, Honda CRV, etc.

If the budget is not sufficient, you can also consider domestically produced SUVs under 15cm, such as the Great Wall Harvard H6, Geely Boyue, Changan CS75, etc. These SUVs also have four-wheel drive configurations, which can further enhance their off-road capabilities.

If you take some unconventional roads and want to see different scenery, for example, if you want to drive to the Everest Base Camp, then I suggest you buy a larger off-road vehicle with a non-load-bearing body structure, preferably with seven seats.

I recommend, for example, the Toyota Prado (also known as the Overbearing) or the Toyota Land Cruiser (also known as the Land Cruiser), or the domestically produced Great Wall Harvard H9.

This car is a non-load-bearing body with four-wheel drive. It has a tall body and good visibility.

Moreover, Toyota's off-road vehicles have always had a good reputation. The rescue vehicles of some off-road clubs are usually Toyota off-road vehicles or pickup trucks.

It can be used as a rescue vehicle for off-road clubs. Just think about it and you will know its strength.

I won’t go into detail about the off-road capabilities of these two cars here.

Why do we recommend seven seats? First of all, you can meet some hikers or cyclists on the road. If you are willing, you can give them a ride. Wouldn’t it be great to listen to different people’s stories? Maybe they can help you drive.

Well, it's hard to say whether it will lead to a marriage.

The domestically produced Harvard H9 is a reverse version of the Toyota Prado. Its quality has steadily improved in recent years, and it is also a good choice for off-road circles.

The above are my suggestions. Of course, you should also consider your budget when choosing a model.