Oh, I didn’t own or store the trailer. I rented it when I needed it and just had a little hitch rack to take one bike most of the time. If I needed to only take two dirtbikes I’d have got a folding bike trailer which takes up hardly any space.
My point was that my midsize hatchback had the same internal space for taking things around as your SUV, just with less weight and fuel consumption. Unless your kids are larger than adult sized and you have five of them?