Here are a couple of pictures of my old boat on the trailer. You can see I had to either power load or really sink the trailer because there was not a winch.
Your loading description is right on target. Your boat/trailer might not be as sensitive because it does have a winch and strap. My old boat had a hook and a turnbuckle.
If you ever get to the ramp to unload and can't get the metal arm to swing down because it is stuck on the bow eye, lift up on the bow of the boat and the arm should drop on out.
Hope this helps.