Set the meeting place at a Starbucks or something similar near the acutal location to qualify the buyer ( money, truck, manpower, etc.) first. If everything is copacetic, have them follow you to the location.
If the buyer questions your plan, just state that you have had one too many flakes and don't feel comfortable giving out the address.
I wouldn't text or email anyone. The chat on the app serves the purpose it was intended, and they tell you not to communicate other than through the app; they can reach personal info through those channels. If they insist on email/text, I'd move on; same thing if a seller insists. There'll be other buyers. Better to be safe.