I'm a big proponent of "lighter is better". Especially if your storage facility and your roof-rack are not set up for easy boat handling, a lighter boat will get you on the water more often than a heavy one. Still, it's worth pointing out that if you are new to canoeing, you might be surprised how much boat you can lift. I'm very slender and not particularly strong, and for me, a canoe that weighs 65 pounds is well below my limit, but it's certainly near the top of my level of comfort and convenience (part of that might be that it's almost never that I need to carry a canoe that weighs more than that). At your weight, a canoe that weighs 55 pounds would be the same percentage of your body weight as a 65-pound boat is for me. It might pay to look for an opportunity to heft a few boats to see what it's like. Once you get the boat on your shoulders, the hard part is done, and from that position you can lean it up onto one of your roof-rack cross bars, or a special loading bar, and you are home free (it helps so much to have a rack system that eliminates any need for overhead lifting). Many canoeing books have descriptions about how to get such an ungainly thing as a canoe up onto your shoulders easily, and there are videos online too.
No matter what, you'll still appreciate a light boat, but one that's kind of heavy needn't be the end of the world.
Touring Kayak Paddles
Kayak Kaboose Trailer
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