I think your chances of a trailer modification are slim. And that will be the case for most any RV I suspect. Do you need to get it in upright with your daughter in it? Or can you put it in sideways and get her in some other way? Or use a folding chair of some kind?
I know the "toy haulers" have ramps at the back that lead to the inside, but I'm guessing that size trailer is out of what you are looking for.
Good luck. Maybe others here will have more creative suggestions than mine.
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