I ‘m really surprised that this never took off as a production idea and can only assume that someone had a stroke of genius and installed these themselves but….
I think the oddest thing about this is that it hasn’t caught on. No building site too rough, no driveway too steep: the ultimate van.
Then again, road usage might be a problem but I know there’s a tank range down the road in Sussex where vans like this would be right at home. Could paint them yellow and have them serve as AA vans to the tanks….