Getting computer work done inside a vehicle is not easy if comfort is a requirement. Driving posture is not generalisable.

The ergonomy of most laptops (and keyboards in general) is poor. The modern laptop that is most ergonomic is the "2 in 1" design, which can be folded and used as a tablet.

For a programmer, an ergonomic keyboard with a trackball, connected to a 2-in-1 portable in tablet mode, might be easiest to assemble from common components for working during travel.

> Getting computer work done inside a vehicle is not easy if comfort is a requirement. Driving posture is not generalisable.

I had a similar situation to the GP in that I only ever used my laptop in a car for an hour or two a week. In my case it was whilst one of my offspring was doing some sports related thing that I had to drive them to.

Most of the time I'd just take a book to read but sometimes I'd like to tinker with some programming thing in that time.

More often than not there was a nice cafe to sit in, or a nice bench somewhere in the sun, or a viewing gallery that meant I could watch rather than staring at my laptop. But not all venues were the same.

Some had nowhere to watch or nowhere to sit in the warm or dry, and nowhere suitable within a short drive, and so I'd default to sitting in the car experimenting with seat angles/etc to get into a position that wasn't awful.

Not owning my own car meant I was often driving something different each time which added to the fun. (RIP UK Zipcar.)

Another option is to plug in AR/VR glasses, which solves the head tilting problem in trains. There are plenty of options around ~500 EUR/USD nowadays, which might be worth it for people with a daily commute.