Sounds like a custom job - you could have a fab shop reinforce it if it looks iffy. You'll have to do some repainting on the trailer though - what a pain.

I've only seen those electric jacks on RV's and they're painfully slow. My father in law has an electric - my trailer is manual crank - and I can beat him every time. Of course he can stand there with a drink in one hand and watch me work while his goes up....