| Vector,
 Don't rent the stands.  Buy them.  You'll have them for your next boat and they shoud last years.  Take a trip down to Brownell in Mattapoisett with a pickup and bring them home.  Last time I bought some they were $40 or so apiece.  I'm sure more now but as renting for $130, not a smart deal.  As far as blocking I use 2x6's made to an I beam box.  Will hold anything and they are light.
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