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I'm not disagreeing with any of the comments stating that full hydro is not the best setup for highway use.......but I do not agree with the reason being it would be more prone to failure. I've spent a lot of time running farm and construction equipment and have never had a catastrophic hydraulic line failure where you instantly loss control. A leak and slow degradation of performance sure, but it was always obvious that something was going wrong well before you completely loss the hydraulics. It was also pretty rare that something failed. Started riding in tractors when I was a little kid and then started running them, and spent many 60 hour weeks running dozers and other construction equipment during the summer when I was in school and only saw a couple of hydraulic issues.
Nobody here has seen a failure on a trailrig that had the potential to cause an accident if they were running down the road at the time? I know I have. Ever seen a front wheel bearing seize on a Jeep while driving 55 mph down the highway? How about a tierod end fall apart? Or maybe the tire, wheel, brake, and axleshaft leave the rear axle on a D44........made a good spark show but fortunately none of the above caused any issues. That doesn't even count the number of failures that happened on the trail towards the end of the day that could of easily of held off for another 30 minutes and happened on the road back to the campground.
Again, not saying you should use full hydro on the street by any means. But also that a quality hydraulic system is no more likely to fail and cause an accident as a mechanical system.
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