First find out if you have disc brakes or drum brakes
The 5th wire is for the block out solenoid feature for disc brakes if you do not have disc brakes you will have a 4 pin elec connection if you have disc brakes you will have a 5 pin elec connection.
We had a 2013 model and it had drum brakes with a 4 pin elec connection no need to block out brakes on a regular driveway .The only time you might have trouble is up a long steep driveway.We now have elec brakes on a 21 Escape
trailer .I find the surge brakes to be a better option but Escape
does not offer it With elec magnet brakes you have to have brake controllers and do not stop better at all .In fact one of the RV magazines said to get the best brakes would be to install disc brakes with elec/hydaulic brakes like most of the big boat trailers and better RV's.