Hello, since a new address is generated every time a transaction is completed, is it possible to use the same bitcoin address for every transaction?
All generated addresses are your own , If we assume that you saved one of the generated addresses from the "Receive tab" in a text file , and you keep giving it each time to people so they send funds there ... you will receive the sent funds to your wallet without any issues.
This answer is valid for every HD wallet out there and not only Blocktrail btw.