Hi,
I actually bought from Amazon display monitor that has battery backup power. It is extremely lite weight and 4K display.
https://www.amazon.com/gp/product/B08743JJSW/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
Thou a little pricey, but worth every $$$ - versatile with everything. DEX, Second Monitor, Light Weight, 4K, and easy fit for my backpack.
Maybe down the road, I will go lapdock but for now this is easy to use and elegant.
tvos
I went with the uPerfect battery monitor
Battery Portable Monitor, UPERFECT Upgraded 15.6 Inch IPS HDR 1920X1080 FHD USB C Monitor Built-in 10800mAh Battery & Quad Speaker, Eye Care with HD USB Type-C Smart Cas
Best investment ever. I enjoy being cable free and the charge lasts for hours. Monitor even charges the phone.
Tied this in with a blue tooth travel keyboard. All works like a charm.
Thou I'd still want a lapdock and waiting for uPerfect to release their 15" this spring. For now, the monitor has many uses and not just for Dex. Second monitor for pc, playstation, laptop, etc...
Very happy with this choice and colors are brilliant.
tvos