"which, like Robinson Crusoe's, was too heavy"

In Defoe's classic adventure story, Robinson Crusoe makes a canoe out of a single cedar tree:

The boat was really much bigger than ever I saw a canoe or periagua, that was made of one tree, in my life. Many a weary stroke it had cost, you may be sure; and had I gotten it into the water, I make no question but I should have begun the maddest voyage, and the most unlikely to be performed, that ever was undertaken.

But all my devices to get it into the water failed me; though they cost me infinite labor too.