Here's a photo I found online and a "U-tube video" of the trailer:
It looks like both of these trailers have a manual awning that looks to be about 16' long. You can look at where the awning arms are mounted on these examples, measure your trailer between the same points and know for sure the length of the awning.
While it's possible to run power for an electric awning, on a trailer that age, I'd recommend staying with what was originally installed. It's cheaper, does the same thing (provide shade and define space) and, honestly, is more durable in windy conditions than an electric awning.
One thing you may want to do before towing the trailer is take a "long, thorough look at the tires"... OEM tires on that trailer are 205 75R14 load range C. The previous owner may have replaced them, may have upgraded to a larger size and may have "eliminated a major issue" by doing so. On the other hand, if those tires are the OEM size and are older than 3 or 4 years, you are probably towing on "ticking time bombs".... Each tire has a "manufactured date" in a small oval on the tire sidewall. It is listed wtih 4 numbers. The first 2 are "WEEK" of manufacture and the second 2 are "YEAR" of manufacture... As an example, a date code of 2709 are tires manufactured the 27th week of 2009.
I'd recommend you get the strongest tires in that size for your trailer. They will be 205 75R14 LRD. They are rated at 2040 pounds@65PSI. The OEM tires are rated at 1760@50PSI. The upgrade will give you an added 1120 pounds of "reserve tire capacity"... Most people have had better luck with Carlisle Radial Trail HD or Goodyear Endurance tires than with other ST tire brands.