Two points: I don't live in a 'Brit enclave and speak English all the time etc etc.'.
That is precisely my point. And yes, people who live full-time in a country generally have a batter grasp of how things are than those who don't.
Secondly: the question of the van was perhaps the most important of the OPs plans.
If you'd read all the posts you would have seen that someone had already pointed that out.
I don't think that optimism or pessimism should be factors in assessing the likelihood of someone finding work in Spain. Realism is indeed much more important and that means looking at things as they are and not as you'd like them to be.
My opinion, for what it's worth, is that in my little part of Spain few Spaniards have got much chance of finding secure jobs for the foreseeable future, let alone non-Spanish-speaking immigrant Brits with no local knowledge or connections and with skills already existing in abundance amongst the unemployed.
I know a fair amount about very few not very useful things, like politics, a little economics and European history of the last two centuries. I know a little about running a successful business through my other half and about being a landlord because I was one. So I think I'm reasonably qualified to pass comment on those subjects even if my opinions aren't always shared.
But I know absolutely nothing about anything else and refrain from commenting on matters of which I know nothing, which are very many. Art, music, cinema, cookery, architecture, geography and many other topics are places I don't go and as for science or technology....
I do think that experience and knowledge of something give an advantage over those who don't have those attributes. So when I know I know nothing, I take the advice of Mark Twain: 'It is better to remain silent and be thought an idiot than to open one's mouth and put the matter beyond doubt'.