I just bought the coolest boat trailer stand ever! Check out Tungbar Boat Drain Stands they make a great solid steel stand that slides on the hitch rail and keeps the trailer totally stable, reminds of a kick-stand. I tried my best to test the stand to see if it fall over or come loose...it's as solid a rock. No cinder blocks, peices of 4 x 4, or replacement wheels needed because the stand is higher than my fully extended 21" trailer jack by 9 inches.

I store my boat 14ft Klamath on my driveway and in the past I had to pull my boat up the sloped driveway, have my wife or buddy chock the tires, then extend the jack wheel all the way and lift it up on a cynder block just to keep the boat drained.
Now I just back up, chock the tires, undo the hitch and slide the TungBar on it. One cool little deal is that you can lock the stand to your chains which in my neighborhood is a good thing or it would be gone.

Best of Luck!

www.tungbar.com