I am just starting a DIY project in the shop. I will add pics and post about my progress as I go...I did a quick search and couldn't find any topics about this so I started a new thread.
Anyway, I stole the idea for the frame from a local fisherman that I met through a friend. It is a simple lever system that uses the wheel as a fulcrum and drops the frame down to the ice. The wheels are set back 5" from center to add a little extra tongue weight so it's not too back heavy. The spindles are welded directly to the pull down and they are held in place with a 3/4" pin toward the front when in transit.
Let me know if you have any ideas or thoughts as I go. Feel free to PM me.