This is what I'm referring to.
My question is can I do without them? Before I bought the boat the previous owner drove it up onto the trailer after we took it for a test run without the guide posts very quickly and efficiently. I was thinking of sticking a PVC pipe in the winch post like in the pic to help me center the boat. That's not my trailer, the winch post on mine sticks straight up which will give me a good idea of the proximity of the post not only if the boat is centered.