I don't know how far or fast you will be driving. But over the summer i had my 15 foot canoe on my HCH and it was a real pain to go over 55mph. don't ask it to do 65. Even down a hill i normally can get to 65-70 just coasting (in gear with a light touch on the throttle so i don't regen) I maxed out at maybe 59mph. I plan on making a hitch for a insight and building a light trailer for the canoe.
Unless you have the canoe opening sealed up i think the shape of the insight would force air into the canoe making it a great parachute  . But if you do try it i'd love to find out how it works out.
Tim
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2000 Silver MT #168, 119k miles, Grid charger, CARD switch, rad block, MIMA #174, Hurting (aka dead) IMA battery which I'm trying to revive.
80.1 Lmpg over 14,654 miles (4/23/12)
Bests trips: One way 58.2 miles- 107.3 mpg round trip 116.8 miles- 98.5mpg Tank: 90.75mpg
2001 Blue CVT "Retired" to the girlfriend - 191k miles my Lmpg 69.3 over 21k miles
Best trip: 56.6 miles-92.3 mpg, round trip 133.6miles-84.3mpg Tank: 623.6 miles 8.30 gallons=75.13mpg
2005MT HCH winter car-52.9Lmpg
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