nice rig! you don't see too many of the old high-roof Civics around. bet you get >25mpg with boat in tow if it's 2WD version. have you ever compared your car's specs with a 2012 Fit? very close.
FWIW--a leak test filling the boat up to floor level would resolve the issue of the snake pretty fast
But...you're assuming that I want her in my boat.