Trailer with fixed coupler so it doesn't pivot

You need to put some poles on the corners of the trailer as already posted or install a back up camer so you can see the trailer. Even the most experienced trailer backer upper would have a lot of problems trying to back up a trailer they cannot see. The trailer must pivot against the tow vehicle, or it would be dragged sideways in any turn. The alernative would be pivoting wheels on the trailer and a fixed connection on the tow vehicle. There must be pivoting.