That is a lot of weight. I guess I would be concerned though I am not aware of any numbers out there that tell you how much the lifting mechanism will tolerate.
I suspect adding the hydraulic/electric would be a bit of chore. You need to install the ram underneath with all the mounting structure as well as the hydraulic pump up front and run the hydraulic lines. I cant imagine doing it with the hassle and cost unless I was just really interested in seeing if I could figure it out----which i wouldn't be. But who knows- at some point that is what HI-LO did !
As an aside- that many panels almost seems like over-kill, unless you are trying to do something with it that I'm not thinking of. Three or four 100 watt panels, especially if they were the thin kind without frames etc, would seem to give you all the charging capacity you would want given the size of batteries you could carry. That a charming little trailer by the way. I like the crank. Welcome to the forum!
Rick
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