We've seen lots of people in France with either sunshades on both sides, an awning on one side, and sunshade on the other, or awnings on both sides. The Dutch couple next to us last year had two awnings, one set up for the dog to live in, and the other for them!
MacHighlander makes a comment: do you no think it would be the wrong shape - I don't think awnings are shaped to fit either side. Most awnings are made by continental manufacturers and fit on what would be the 'wrong' side in this country - so fit just the same on the 'wrong' side of a British van. We have a 'wrong side' van and our normal, bought in Britain, awning fits perfectly.