I would think if you mounted it correctly it would be ok. Heavy bolts and maybe some type of large mounting pad and backing plate to distribute the weight. I can't imagine a 20 weighing a whole lot more than a 15, but depends on the model for sure.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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