@RD Thanks for reaching out!
A really good option for a cart for a canoe is the Suspenz HD Airless Kayak/Canoe Cart. It has wide tires to accommodate various terrain (grass, sand, dirt, etc.) and is rugged enough to handle a large canoe. If you're also transporting a kayak or if you are concerned with the depth of the chine on your boat, you could go with the Suspenz HD Deep-V Airless Kayak/Canoe Cart. Lastly, if you're going to be crossing lots of sand, we recommend thinking about something with even broader tires, like the Wheeleez Kayak Cart - Beach.
Hope this helps!