I used landscape ties in an X from the ground up to a couple stacks of 2×4 about 2 feet high on each side for the back. Used the trailer Jack to lower the bow and place the supports under the stern. I then used the Jack to raise the front of the trailer until the boat was off the axle and sterns trailer bunks. Then built a tower of 2×6 to place under the bow. When I lowered the Jack the boat was supported just above the trailer bunks and I was able to slide the trailer back a few inches.
If you want to bottom paint you should use the club’s Go Hoist and support stands. Look under the resources tab for club tools. Good luck.