We full timed for seven years, most of it pulling a sixteen foot flatbed trailer carrying a C4 Corvette. We had two occasions when we could not leave the trailer connected to the motorhome. The first, in California, the park host used a trailer ball equipped fork lift to move our trailer to special parking and return it to us in the morning. The second was in Oregon and they had an easy in/out trailer parkinng area.
In our current mode of part time RVing we are using a tow dolly, but I'd love to have an aluminum trailer such as you are considering.