I have a 3ft by 4ft trailer, like this one:

https://www.halfords.com/motoring/tr...er-216502.html

The rear panel drops down and is unhookable and hence removable from its
hinges.

The remaining 3 sides are fixed. They are bolted to the base of the box.

I would like to try and reduce the volume of space it takes up in my
garage by essentially converting it to a collapsible trailer.

My idea is to buy a pair of 4ft long piano hinges and a 3ft piano hinge
and install them in between the three fixed panels and the base of the
trailer box.

The idea is that the two side panels can fold down flat over the wheels
and the front panel fold down onto the Tow bar arm, thus reducing the
space needed for storage in my garage.

Has anyone done this or have a better idea?

Obviously my main concern is not affecting its load carrying capacity....

S.