We tow a 22' enclosed trailer behind a 40' MH. I have not had any problems finding a site big enough for this combination, although I did have to move the trailer to an overflow parking area one time.
I haul a GMC Safari van(raised roof conversion) and a side by side ATV. The van has a hitch on it so that I can use it to move the trailer if necessary. As stated, I have only have to do that once, but I think it is mandatory that the vehicle being hauled has a hitch on it. I must admit, the sliding door on the van does make it easier than a car to get out of the vehicle when inside the trailer.
A trailer is not the easiest way to bring a car when traveling, but we wanted to bring the ATV too. There always seems to be a trade-off depending on what each individual wants.
One advantage to towing a trailer is that I don't have to be quite as concerned when pulling into a crowded fuel station are a tight parking lot since I am able to back up if necessary.