Looks impressive and a bit like domestic windows. I guess if you were having them made you could ask for any glass you wanted.found them https://www.ew3.de/ they do appear to be pretty similar to residential UPVC windows so think im going to investigate that option as I never liked the MH plastic windows. I guess weight and vibration are two key factors to consider and those expedition vehicles can probably afford the extra weight. They use Eurodur® ESG (Toughened Glass) is a tempered safety glass which is up to five times stronger than regular glass with the same thickness.
When you’re taking on work the size they do, it doesn’t take long to be overwhelmed.here's another manufacturer in Doncaster UK https://www.motorcraftadventuredevelopments.com/premium-windows
sounds like they have more demand than they can handle
prices look better too, I guess the budget depends how many windows you want and how important the look and function are but certainly look better than the standard MH type