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To be fair, I had a diesel Peugeot expert van for a while, and while I wasn’t a fan of the van as a whole, it got to temp a lot faster than the diesel Ford Transits I drove. I guess my point is that there must be vans out there more specifically designed for short journeys - it’s a massively common requirement.
Short journeys in diesels tend to be bad. If it’s modern and has a diesel particulate filter, lots of short journeys will block said filter and cause problems. It’s generally bad for diesels to not get to temperature (which is what happens when you’re just doing short journeys) - they won’t run efficiently (poor MPG), and it will increase engine wear. Then there’s EGR valves and other parts of the system that rely on hotter temperatures to burn off material that will build up inside otherwise.
Here’s the EGR valve from my diesel bmw that likely spent a lot of time doing short journeys.