Here's a suggestion for a replacement species (among others), what about Casuarinas... they are also commonly called Sheoaks. They are exceptionally hardy, and plant well in 'groves', cast reasonable shade and grow fairly quickly too. They even whistle in the wind - I'd miss that sound if the campground was filled with dust bowl inducing gums. The only downside is possibly the small cones, which if in larger numbers, could get annoying to put a tent over.
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