I bought the larger of the two Wheeleez kayak/canoe carts because my use for it does not include taking it to sea with me. Rather I use mine to get the boat from the car parking area to water's edge. This often includes sand and/or uneven surfaces and quite often fairly long portages. My Long Haul MK1 is quite heavy especially when loaded with stuff. At a guess it could easily exceed 100 pounds.
With wide, soft, floatation tires, the Wheeleez cart makes hauling the boat much, much easier. It is stable, the tires don't dig in, but ride over sand as advertised. The frame is marine grade anodized aluminum tubing, important in a salt water environment. The wheels have actual bearings, which should provide long serviceable life. The poly tires are thin, soft and squishy, which is why they work well over sand and uneven surfaces, but probably could be the weak element in terms of durability. The owner's manual specifically cautions not to over inflate these tires. They are rated for only 2.5-3.0 psi. This low pressure requires a special air pressure gauge, which is not cheap and adds to the total price of an already expensive cart.
This cart is wide and therefore, stable side to side. The cart is low, making for a lot of bending of the back to keep the ends of my 16' long boat from hitting the ground. The low height, coupled with the lightweight tires makes me speculate that this cart would be less than ideal for long portages in the wilderness. That is the down side. For it's durable construction, ease of rolling over soft or uneven terrain, and load carrying stability, give it full points on the up side.
