It was last used on a Fleetwood Garland 128-2 (2 berth) caravan, internal length 3.81m. The awning is rated as 780cms. size, (Which I believe refers to the overall length approximately, from the ground, around the awning rail and back to the ground the other end.)
It is in a reasonable used condition including all poles except that two of the transparent plastic window panes have started to tear on one side. This could possibly be repaired or it could be used as it is, in reasonable weather. The zips haven’t been checked but as far as we can remember they were all working when last used.
Please note that the fabric used on these older awnings was of heavier weight than I think they are these days and therefore may have a bearing on its suitability for your purposes.
Sorry we don't have a photo.