Driver's side of my trailer because that's the side with the best hookups for my outdoor kitchen.
Some folks prefer the awning on the passenger side so they can deploy it when parked along a curb, so the awning goes out over ground, not the street or trail. To be honest, in all the time I've used mine, pretty much full time for over two years and all over the country, it's never bothered me to have it on the driver's side.
I do have one I'm gonna put on the van, too, and that will be on the passenger side, because I want it to cover and shade the side doors on that side.
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