Take this for what it is - I've never owned a full-hydro rig. that being said, everything I've read suggests that on the street they are passable but not a good idea. (Also, I think illegal when configured with a double sided ram in the center?)
The exception was a setup I saw in a magazine once where they had a high-quality PSC ram pushing a tierod. It was configured like a hydro assist but there was no draglink. They said the road manners where great, presumably because you can do a proper alignment. That type of setup would let you leave the front links alone. (I don't know about the street-legality of it.)
There will be many who say full-hydro is FINE for the street... but that is typically just something said because they do it. A kid on Pirate died when his malfunctioned and he crashed. Of course he wasn't wearing his seatbelt, nevertheless it was a tragedy with root cause in the full-hydro steering.
