Boat stands- concrete blocks?

We took 95%+ of the weight off the trailer. Blocks and jackstands on rear corners. The front stands are at windshield and wedged on the outside edge of the hull. Left just enough pressure on the trailer to keep the boat steady. The hull is level side to side, and fore to aft.

Interesting that this comes up today. I am pondering what exactly I am going to do. I just traced out my stringers and will be standing the boat up today or first thing in the AM. I have large set of jackstands, but they are under my wife's convertible cause the trans needs to come out. I have a smaller set but they are way too small. I have a big pile of cinder blocks and think I will do just what you are talking about above. Blocks, stands, boards. I also have a bunch of popped motorcycle tubes I can cut and put between the boards and hull. Just for antislip, I do not care about hull scratches. I may notch the boards to set down on the cradled top part of the stand, and not be able to slip.
I am just going to lift it off the trailer, not remove the trailer.
Two under the transom semi close to the corner, and two under the windshield on the outer part of the bottom of the hull. I may put one safety block under the keel.
I am thinking a couple of us can just lift the boat up and adjust to level. I can easily lift the back end myself. Taking it down will obviously be a bit heavier.

You do not need to remove the trailer. I did so mainly to get it out of the way so I wouldn't cover it with dust or fiberglass. What you do need to do is to block up the perimeter of the boat before removing the stringers. If the boat just sits on the trailer, when you remove the stringers, the running surface will flex just from sitting on its own weight. You can easilty block the boat up with cinder blocks, jack stands, wooden blocks, etc. leaving it just above the trailer. Perhaps even wiht the running surface just sitting lightly on the bunks. Level it, and then you are free to remove the stringers witht he trialer in place. BKH

How high did you stack them? It is a 83 SN and the trailer sits pretty high, about 30" or so. Won't I need to stack them about 4 high? I'm nervous they will want to rock.

Yes, this is not hard, just time consuming.

You will need a floor jack & blocks or jack stands, some wood blocks & carpet to protect the gel coat.

Lower the bow all the way with the trailer jack, block the stern on both sides.

Raise the bow, block up the keel at the front. Level the trailer & you can pull it out some.



Removing the prop guard (if you have one) is advised.

You will have to jockey the supports a few times to get them past the trailer crossmembers.

Take your time & always double check your support before crawling under the boat.