Welcome from south Louisiana.
I use a fan that hangs from my ridge line inside my WBBB. It helps a lot! I love summer so I don't le the heat stop me from hanging. U can find the fan I use at Coleman.com or local wallmart usually carries a cheaper version in the camping dept. Academy and Dicks sporting goods has them as well.
As for the trees you are looking for....come over to your neighboring state of Louisiana, we have plenty trees. Send me a private message and I'd be happy to let you know of a few places to hang over here.