Here is a link to the unit I have.
WalMart of all places
I put 4 of the plastic stickon type hooks (hook comes off the base with the sticky stuff) on the door. That is to mount the 6.5 x 20 inch panel the hoses attach to. I made a gap filler out of 1+inch foam to fill the space betwen the panel and the screen. Cut two holes in the foam of the appropriate size. Otherwise there some of the air will blow back and not go thru the screen.
Hoses are 5" diameter, and stiffly flexible. I am going to have to redesign my mounting because I put a frame around the mini blinds to keep them from flying all over every time I go in or out the door. If I still go thru the door window, I will need a much thicker piece of foam. considering putting the mounting hooks on the walls, but that could be tricky to get right.
Rather than cut round holes, I am thinking about an RV rectangular door of the appropriate size.
That way it could be locked, water tite, and conventional looking.
I used it in 105 degree Texas heat for a week. It would cool down to about 85 in the trailer during the day. Tolerable with a good fan. At night, it would pull the inside temp down further as the outside went down. So, when it got to 95 at midnight, it was 75 in trailer. Used it in Florida for 3 weeks last summer with no problems.
For traveling, I have two locations set up for it to ride in. If trailer is balanced, it rides strapped inboard of the closet. if trailer is tail heavy, it rides strapped in left front corner. Still allows use of toilet while traveling. I use some dense foam around it for cushioning.
Curt