Unless it's a show car and needs to be enclosed, putting a car in an enclosed trailer is a pain. Have you tried it?
Originally, because we have a Ford Escape which is not towable four down, we thought of using an enclosed trailer. Try this like I did. One of our garage doors is a standard 8' door which is the same as the inside width of an enclosed trailer. Park you vehicle in the garage door so that when you open the vehicle door, it will hit the side of the garage door. I'm not fat, but there's no way I was going to get out of the Escape without climbing out through the window.
I talked to a friend at a moving company because I know they move cars inside of moving vans that are 8'6" wide. He said they have the skinniest person on the crew drive the car in with no shocks on. Then they climb out of the window, walk down the side of the car and then hope off of the back of it.
Just imagine if you're trying that and you slip, breaking a leg with your foot wedged between the steering wheel and the dash. I think the rescue crew is going to tear out the whole side of your trailer.
And to secure the vehicle, make sure you're get a door up front in the trailer so that you can enter in front of the car to tie it down. Then your're going to be down there with a flashlight hooking up the straps. A door on the side of the trailer, in the middle where the car will be won't work unless you're going to climb over the car.
Just think, you pull into a campground to just spend one night on the way to someplace else. But, oh no, you're out of tomatoes and beer. By the time you open up the trailer, unstrap the car and then restrap it down, having used my towbar that only takes two minutes, I'd be long done with dinner.
And as far as saving wear and tear on the towing a vehicle, in general you're going to do more maintenance on the trailer bearings, brakes and tires than you would on a towed vehicle. And be sure to put a hitch on the vehicle you're going to enclose so you have an easier way to move the trailer around when you get into a place where you can't turn the MH and trailer around because either lack of room or you can't see around the trailer to back it up.
If trying to get out of your vehicle while it's parked in your garage door doesn't convince you not to do it, I'll be surprised if you put up with the enclosed trailer more than one season.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.