Read reviews for the Four Wheel Canoe Cart by Piragis Northwoods as submitted by your fellow paddlers. All of the reviews are created and written by paddlers like you, so be sure to submit your own review and be part of the community!
Unfortunately, the quality of this product is not near the value of the $100 they charge for it. The wheels are made of thin hard plastic that will not handle any kind of concrete; the axle is made of a thin steel that will rust in any water use; the wheel spacers are a thin, poor quality plastic; and the frame is very flexible, not nearly as rigid as it needs to be for this type of application.
Other than the interesting design, there is nothing good to say about the actual cart. Great idea, poor execution. I would save the $100 (and $12 shipping) and make your own out of some wood, pipe and wheels and save a lot of money (and be better quality).