Update: I looked at several carts, then had the "Aha" moment hit me. I need one that will be lightweight and fold down and fit in my suitcase for travel too. I travel with all my gear except tanks and weights, so I gave in and bought the system. It will be interesting to see how much "drag" it creates in the water, so I'm a bit hesitant. Oh well. It's definitely lightweight, construction looks very solid. I'm not going to haul it over big rocks, I don't want to test the wheels that far! Ease of use, ...well practice at home loading up your gear and wrapping the bungies, then reverse it all (as if u were in the water now preparing for your dive), stow the bungies and the handle so you stay streamlined.....so u see it does require effort. I have a cold water b/c so it is bulkier than the warm water ones, so by the time I got all my gear stowed as the video and instructions demonstrated, I had to really pull on those bungies. I will post a report after my next 48 degree fresh water dive in two weeks.
This is what my GF purchased at Costco (Canada) two years ago...It is fairly light and foldable with telescopic handle