Most of the places people go camping and off-roading are subject to wind - mountains, beach, etc. I've been in regular RV parks where its been a beautiful day and the wind kicks up and everyone's awnings from cheap Winnebagos to top end Airstreams wind up looking like hang-gliding accidents. Expensive awnings are expensive (and heavy) for a reason - they are better suited to these potential conditions. Also, the good ones like Alu-cab's shadow awn deploy and pack up quickly. The draw back as you have zeroed in on is cost and weight.
I have the Alu-cab, but for a day on the beach I usually go with a Kelty Noah's tarp affixed to the roof rack and staked down with ground grabba sand anchors. This makes for a nice shady area on the leeward side of the truck out of the blowing sand making an otherwise miserable beach day workable.
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I can deploy the Alu-cab for a quick lunch on the side of the trail when touring and be out of the midday sun - where I have used it the most is touring in NPs like Yellowstone where you can sit on a road side pull out and gaze at the comings and goings of the wildlife.
Developing your real life use case is the first step. How many times are you unable to find adequate shade or shelter where an awning would make a difference? We've used ours at dog shows, football tailgates, in national parks as previously pointed out, but it certainly isn't a daily thing. In my personal experience, it's been nice to have, but not need to have. You may realize in the end that an awning seems like it would be great, but in practice will just serve to reduce your fuel economy. The tailgate/liftgate kinda handles 90% of what you need. My wife and I sit on the tailgate and eat lunch way more often than do we deploy the awning for that. One of the great things about the 200 series.