G, I remember that thread, but being the guru that you are, I'm sure it was no sweat
J, you'd probably have to ask the man that question, I saw a thread he started saying that he was selling them and I just bought one. I'm sure he'd sell you the plate separately though. Check the website or phone number I listed and give them a call.
Rich, My boat is too heavy to move without some sort of machine, so I couldn't tell you. I was able to move it a couple inches by hand, which is more than with the other jack.