Fish-On-
Cut the rear bulkhead out, this is the first step in pulling the tank, and it’s not a big job. Check the condition of the lower corners of the tank. If it has rot I think you will see some signs of it when you scrape the foam off. If not take your time and carefully remove it. Power is the key. I was by myself. I had a 2500 lb come-along and a saws-all. I cut along the sides of the tank, pulled it straight back to break it free, then up and out. The pipe inside the filler hole is a good idea if you want to save the tank; I trashed mine with the hook.
If you can rent one of these it’s a piece of cake!
EGreen