DEFINATELY get you some 2"X2" aluminum squares and some large stainless flatwashers for the mounting bolts on the inside. Thos will pull the transom in some over time and will require retightening like that. Fiberglass compress's some if you don't spread the load out evenly. And as for the sides, you don't need them through bolted for strength of the bgracket. You need them bolted through for strength of the platforms. Think about how much stress is on them with a 200LB person up there, then multiply it times 3 to simulate what a person on it with the boat rocking would do to it.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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