Read reviews for the 4 Wheel Canoe Cart by Quantum Engineering 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!
The cart is very well-made and is easily attached to the canoe in just a few seconds. You put it on the canoe after parking, and use it to take the canoe off the car. Then you just flip the canoe over and use the other set of wheels to transport to the water--where you can remove the cart to stow in the canoe. After retrieval, you can install the cart (again, just by lifting the stern, placing the cart OVER the end of the canoe and snugging the supplied webbing and clip to a thwart) and ferrying the canoe back to the car where you flip it over and use the other wheels to load up. Remove the cart from the racked canoe before driving. I'm not aware of any other cart that is so versatile.
I would say that this is not intended to haul a canoe over a mile of soft sand or boulder and root strewn portages, but for the majority of distances and surfaces that most of us deal with, the Quantum Engineering Four Wheel Cart will leave you (and your back) smiling.