Sorry to hear your system broke and there aren't replacement parts available for your horse trailer.
The Bulldog Velocity Series Electric Landing Gear Jack - 24" Lift - 12,000 lbs # BD185400 is a good replacement for your discontinued and broken system. It will simply bolt right on to your trailer so it can utilize the 12V power you already have run. It is able to lift 12,000 lbs and lifts 20 inches in 60 seconds.
Another great option for you is the Bulldog Square Jack - Drop Leg w/... view full answer...
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