That's odd, usually tortion's seem to sit lower than the leaf spring models.
however, if its too high its too high... not sure about adjusting the tortions, would smaller tires do the trick ?
as long as you check things out, then do the trade.
edit: since i've only seen tortions and owned leaf, are you SURE that you can't adjust the height?
I asked My brother in law, he said he adjusted the height of his tortion trailer to match his shop stand, it wasn't a rocket but he said he popped a cap off, pulled a pin, and spun the suspension down, put the pin back in, in his case he was raising it but he said he could have lowered it and it took like 2 minutes. (ski off trailer)