Yes, I have a similar size Manfrotto, the 075, and the centre column develops a little play after a while, which disappears as soon as you lock it. And you are right, I found the 058B OK...ish, but I wish they adapted the same leg mechanism on a sturdier and lighter tripod. Still, it seems the 058B is the only one tripod I can find that will go up and down easily.
I like the idea of a dolly, particularly a sturdy one which can apply breaks on the wheels. In an ideal world, I'd like a dolly with a central break to all three wheels simultaneously, but I am not sure they exist.
This way I can probably put my foot down on the dolly whilst I raise or lower the whole camera/tripod to the desired height, making the whole thing quick and easy.
With a conventional tripod, you normally adjust the legs to what you estimate is the right height, then you check from the camera point of view and think, umm, actually, I want it a bit lower, so back to the tedious task of lowering each leg a little more and so on. It's really not practical if you need to move fast, something difficult to understand unless you are a photographer who regularly works in such situation.
