I like your setup. I've been thinking about a winch for the front of my trailer. I have pulled some big logs up my ramps with my fiddle block, but a winch would be better for that.
Are you a one man show? Do you haul all of your logs in your chipper truck?
I bought a log arch a few weeks ago and it has worked great for me and increased the size of wood I can handle. It works great for my trailer, but there's no way you could load a taller trailer or truck with it. An arch definitely saves your back and could get logs to your truck. There are couple of pics in a thread I posted recently:
http://www.treebuzz.com/forum/threads/fun-job-and-new-equipment-for-fledgling-tree-service.35522/
Keep in mind, you won't be able to move logs as big as the ones frashdog posted. An arch is not a mini skid, but they don't cost near as much either. I think they're a good option for a startup trying to avoid debt.