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What would be a good solid reliable choice for a work stand to be used at events (in a big crafter sized van)
You don't need a van specific workstand. Most of them fold and I can fit my stand in the car so you should have no problems.
FWIW it's one of these, had it for years and it does the job
https://www.merlincycles.com/bike-tools-workstand-49075.html
Quite happy with this one https://amzn.to/2PWGyax but they aren't cheap.
Folds quite small and you can get a storage bag for it (costs even more!)
You could get one of those wall ones and fix it to the one of the barn doors on the van.
I saw a van build with something like this fixed to one of the back doors Wall mounted work stand