I had a thread back in about 4 or 5 years ago but I'm having locating it on the newly formatted forum. But, I will give you the high points of that thread.
- Shift the pontoon back on the trailer with about a foot hanging over the back. I did this by chaining the rear to a tree and pulling forward slowly.
- Place wooden blocks under the rear of the pontoons
- Disconnect the trailer from your vehicle. WARNING...WARNING. You will likely have negative tongue weight at this point so add weight the front of the trailer temporarily to prevent it popping up and knocking you head off.
- Pull the vehicle away and lower the tongue all the way to the ground.
- Add more blocks to the rear to fill in the gap created.
- Raise the tongue all the way up.
- Place a 4x4, 6x6, or a strong pipe at least 12 feet in length across under the forward deck and block up each end securely.
- Lower the tongue and pull the trailer out.
- Add blocks under the pontoons to ensure it is secure on the ground.