I'm with you all he way on trying to move a dual axle trailer around on concrete when loaded Tony. I just did so this week on a job site & it was a nightmare! So much so, that I'm thinking of taking my ratchet moving jockey wheel from the camper to work with me in future.
Our last camper trailer was single axle soft floor with about 48kg on the ball.
A few of the places we took it were; Oodnadatta Track, Mt Dare, Dalhousie, Chambers Pillar, Finke, Old Ghan Track, Lambert's Centre, Painted Desert, Mereenie Loop, Eringa Water Hole, Charlotte Waters, Palm Valley, Cameron Corner, Dig Tree, Eromanga, Quilpie, Thargo, Eulo, Dowling Track, Strez Track, Birdsville, Birdsville Track, Flinders Ranges many times, Gawler Ranges, Stuart Hwy a few times, Savannah Way through Hells Gate, Roper Bar to Borroloola, Lorella Springs, Burketown to Adelaide via Winton, Longreach, Charleville & Bourke.
I'm sure I've forgotten some of the places we took it, but we had a ball.
As an aside, it was Chinese. And it never let us down, anywhere!