Direct answer: Eagle publishes 27 feet and 600 pounds as the maximum gate rating for the Eagle 1000 FR. A 27-foot gate is therefore at the stated length limit, not comfortably below it.
Length is not the only load
The gate still has to be within the weight limit and roll freely. A solid gate exposed to wind can also be a much harder application than an open metal gate of the same length.
See the full Eagle 1000 FR model record.