Beware of using the A Frame !!!!!!!!
Unless it has been designed and braced for pulling ( and most have not !), think of your A Frame like a roof rack on a car ....and you wouldn't tow another car with your roof rack .. would you?!
Another useful way to think is that your transom is a big strong board being pushed by an engine and that the transom just happens to have a boat attached out front. Think about it !