What's the lowest moisture content a self-propelled forage harvester can handle?

Suppose we mow the forage, spread it wide, use a tedder, then a rake to make a windrow and then use a machine like a Claas Jaguar to pick it up, chop and shoot it into a trailer... how dry could we make that forage? 

 

Besides that, I want to use a controlled traffic farming system, and that is another reason why I like the idea of baling the forage, because the baler can follow the same tracks as the other machinery.

 

In the case of forage harvesting, I have seen photos/videos of a tractor and trailer following behind a SPFH but if the trailer fills up before reaching the end of the windrow, it would have to veer off the tracks to allow another trailer to come up behind the SPFH.

 

So then another option is for the trailer to run along the next set of wheel tracks to one side, so then the question is what's the maximum distance between the SPFH and trailer in order to get the forage inside the trailer? If the distance between the centre of one set of wheel tracks and the next set is 6-metres, would it work? 

What's the lowest moisture content a self-propelled forage harvester can handle?