36onslow, I don't believe hp will help you much; torque should help some. I suspect you will find you are sorely disappointed in the performance of the Santa Fe with that trailer, and - like many of us on this forum - you'll end up getting a bigger, more capable tow vehicle within a year or two. In the meantime, take it easy! I suspect the trailer, loaded for camping if you travel light, will weigh somewhere around 4500 lbs. If your family is the kind that has to bring everything "just in case," then you'll be fully loaded about 5000 lbs or more. As you pointed out, you wouldn't be the only one out there with more trailer than vehicle! Good luck with it!
Some good advice about checking for mold (also leaks) around the bed ends, particularly in the front. All hybrid trailers have been prone to leaks around the front bed end in rainy weather when towing.