C-tug is robust and effective, and very quick to assemble. Note the wheels don't go through a standard round sea kayak hatch, just in case your boat doesn't have an oval hatch. If you get the inflatable version, deflating the tyre means you can push through a round hatch, but then you need to inflate with a bicycle pump to use, a pain, and provides midgies lunch. As mentioned above you are also at risk of tyre/tube failure. You maybe able to store them in front of your foot pegs. You can cheaply buy smaller diameter trolley wheels from other manufacturers that will fit through standard hatches, obviously useless for portages but fine for trolleying on smooth surfaces, e.g. on and off ferries
Disagree on comments regarding size, C-tug does take a fair amount of space up in your hatches.
I never bothered to fit the stand leg. Try and keep sand out of the roller/bearing surfaces as on the c-tug it will wear the plastic (probably a good idea for all makes).
Horses for course, if just getting on and off ferries get a small light collapsible job, if likely to do anything more something more robust is essential.
Post edited at 11:54