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I have owned three Bertram's over the last thirty years and have winter stored in a half-dozen yards. I have seen blocking on the keel with jack stands on each side and bow block with the stern hung by the chines. What is the method of choice?

Mine has always been 2-3 blocks on the keel, one each on the stern corner chines and either jack stands or wooden side supports midships. Walter

I usually go with 2 sets of blocks for the keel, 2 jackstands on the
transom corners and 2 jackstands on either side at midship.

correct blocking puts all the weight on the keel, the stands are just there for stability.

3 sets of keel blocks is a good idea

stands/blocks aft by chines, stands/blocks by chines about midship for stability