The Hunter planer has adjustments that can be changed to cut deeper on one side then the other, if you need to try and square up a timber.
I've seen this planer up close and personal when he demonstrated it at a logging equipment show in Bangor ME. He asked the woodmizer sawmill guy to cut a log to make a 12" wide timber and then he set his planer up on it and planed it right in front of us. He brought with him his own personal generator to get the power he needed to run his planer.
It was a very smooth surface.
What Mr. Hunter does, besides selling planers, is he cuts timber frames and sells them to other people who erect them.
He told me that he just planes the timbers he's going to use that day, so everything is fresh planed when he brings them into his shop. All his joinery is square rule layout, and I'm not sure if he planes the non showing sides or not.
I almost bought one of these but the job that was going to pay for it fell through, so I didn't.