Yes, that would work and the horses would not mind at all. The bad part would be if you were out in the middle of nowhere and the battery went dead or had a hydraulic hose to burst. Not likely to happen to anyone but me though......... : )
Yeah, you do seem to have a particular talent for having mechanical difficulties with your equipment. Reminds me of a little cartoon character from long ago, I can't remember what his name was or what strip he was in, but he had a little rainy cloud hanging over his head all the time and just seemed to have the worst luck.
Pre or post loading wouldn't be that big a problem but if they are in the process then you might have a problem:')