[LTM] Power

Quick question, what is the max power out can we get from LTM-1 and is there a possibility of adding an "external amplifier" to the stack?  e.g. fits on QTH/QSH bus maybe and input is just the output of the transponder, picture your rig and the amp in your shack.  No power supply considerations, just raw what if for the transponder.  Thanks!