That would work on the fold away tongue. My trailer didn't have the space to do it. A fun thing is as you pull the trailer in the front jack's wheel will always fall sideways into the gap between the ramp and the trailer frame. Another thing to remember is you will be attaching the winch to the center forward d-ring in the floor. If you hook the end of the cable to the very front of the trailer, it will be all the way in before the trailer wheels are beyond the beaver tail in the floor. So, you need to find a place to hook it further back on the trailer. Also, remember to buy a winch with a brake. A standard winch will not have one and when you let go of the trigger any tension on the line will pull it back off the spool. Lastly, because it's attached to the floor and the boat and trailer will be below the breakover point on the beaver tail section of the floor, you will want to change the winch cable to synthetic. As metal cable drags across your rubber flooring it will gouge it up. The metal cable that comes with the winch is also too short. You need at least a 25 foot synthetic.
I used this winch. The ski is now sold as it was not our favorite toy and was too much of a pain to load and unload. (Remember, you will need the winch to unload as well so the boat doesn't go flying down the ramp...)