In order to accommodate working from the van better, I decided to install a 4G antenna and WiFi router. The idea is that, while a phone does work very well, a dedicated antenna outside the Faraday cage that is a van would improve the chances of actually getting a signal vs a phone.
The antenna is a Poynting MIMO-3-12, which is a 2x2 MIMO 2G/3G/4G/LTE/5G antenna. The router is a Huawei B535. There is a small irony in that the router has a 4x4 antenna, which is faster than 2x2, but it isn't quite as strong.
Installing this did require another hole in the roof...
Installation
Would recommend a USB-C monitor, btw. The cheap ones don't have great colour, but they get the job done.
Bling
I also invested in some van bling. The old wheels were very tatty and I decided something a bit nicer was in order.