The large Sugar cane trailer will work but is a 60000+ liter side tipper so unloading it in a field will be interesting, it may work if the Carting tractors swap it out all the time to unload at the Bunker. It does hitch to the NH though, but wont accept chaff from the NH forage harvester. The trailers in game that do work are happy accidents rather than true to real life usage, Though I wonder about the Krone Cargo which is a real life Trailer and has a Mod available (converted from FS17?) that will work only with Krone harvesters. It appears that in the Real World towing a trailer with a forage harvester is usually limited to the harvester header trailer they are not intended to pull heavy trailers for harvest. I was looking for information on this too.