What is the advantage of a open bed?
In Europe the role of a small commercial vehicle like this would be taken by something like a Mercedes Vito or a Ford transit connect. I really can't think of a reason why you would choose a TELO over a Nissan NV200.
If you haul dirty stuff, it’s much easier to hose out a pickup than a cargo van or suv.
For a half way point between tent camping and pulling a camper/caravan, slide in campers work with pickups but not cargo vans. If using a cargo van for camping, you probably want something that allows you to stand. That calls for a high top or a conversion that adds a pop top.
Yes, in the UK pickups now seem to be status items. I don't think I've ever seen an open bed used. I've seen a few towing big trailers, that's about it.
I’m hopeful that smaller vehicles like those supposedly coming from Telo and Canoo can change the market. The Ford Maverick has shown that a modern pickup can be smaller and fuel efficient. Telo looks interested in upping the ante.
This is tangential, but the Ford Maverick has also shown that automotive OEMs are not ready to contain battery fires. Not hard to one-up a truck that might experience thermal runaway.