In my area it was a common accurance to see the cart on the large suare each Saturday morning, ( weather permitting). This has now escalated and I see a cart, on both the large and smaller square on anyday that I venture in to town.
In my opinion these carts could be a very successful way to witness. Why not carts in the park ? Why not carts in the main shopping centre? (which is outside the city centre) Why not a cart outside the train station?
So my observation is that I don't feel the enthusiasm is their, it is simply done as a duty, In my opinion those standing by the cart get the sattisfaction of thinking themselfs zelouse witnesses as they stand away from the cart and contently talk amongst themselfs.
But the simple fact is the carts are an excellent way to target, identify and educate people who have a spiritual interest. If the carts are not effective in my opinion it is an incitement on the organisations general desire to make it work.