Feedback on an new system.

sounds like your attempting something similar to oshkosh's M1000 HET trailer.......although it has 40 tires (all hydraulicly steered) and yours will only have 8

http://www.youtube.com/watch?v=Ktzea3gSWoM

its hard to see in the video, but they do all steer
actually driving one of those trucks is more like driving a car, than a semi

 

When I drove in the UK we had some trailers with rear steering axles.
I dont know how they worked exactly, but they kicked the trailer wider in the corner so you could get around the tight turns in the UK.

The video of this one shows it reversing too.

Mine was similar to the video I am posting.

I could get into places that most just dreaded.

http://www.youtube.com/watch?v=eTGYofstwLE

 

I have seen a few specialized trailers that use a remote controlled system similar to what you are describing. The one's I have seen were used for hauling windmill blade assemblies. I think they even had a show on tv about them a while back. Basically a second person (usually the chase car for the oversize load) would get out and drive the trailer axles by remote, while the driver controlled the truck around the turn. Great Idea best of luck.