We've just bought a second-hand dehydrator (thank you Facebook local groups!) and so far I've dried tomatoes and mushrooms, both of which were very successful. The tomatoes I grew myself and the mushrooms came for pennies from a local market, so I was doubly fortunate. Having seen television programme where an entire banquet of raw food was prepared I tried drying sliced courgette, but don't think I left them in long enough. Perhaps I'll try the car drying trick and also see if drying them faster works better.
Have you tried vegetable crisps of any kind?