Gary, Your a little far to travel to borrow a trailer and would buy an adapter if I ever needed it. Every tailer at the two rental yards I use are 4 wire flat, Every trailer I have borrowed in the past has been 4 wire flat. Every boat trailer I have pulled for a friend has been a 4wire flat. Ill need a 4 wire flat one way or another, If it can in the same bracket so much the better.