I use ours in our Clam screen tent that is much shorter than your camper's awning. We've done it with the sides open (like shown) and with them mostly closed (with just the small square windows open).
I know it's not great for the fabric, but the toasty warm feeling makes it worthwhile.
2018 Ram 3500 DRW/crew cab/long bed/4x4/4.10 gears pulling a 2017 Spartan 1245 by Prime Time
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| Was a Fulltime Family for 5 years, now we're settlin' down for a spell