Is this something that is specifically designed for a trailer, my reason for asking many trailers have a lot of flexibility and movement. Is the unit something you can source? If so a square, tape measure and screw gun should be all that is needed. Possibly a wood frame to get the rough opening correct
They are designed for trailers and I haven’t found a source yet. It was on the option list when I ordered the trailer and in hindsight I wish I had ticked that box. That and the escape door. I know I had seen someone on Facebook that sold and installed them.
Looks cool, I could see myself driving through one, lol. I’ve installed a thousand patio doors, so hit me up if you need help.