Residing The Side Walls

The Right Wall - before, during, after:

How it was done:

Removing the window loosened the outer
ply enough for the wind to rip some off.
So glued the survivor.

Spurted glue into a multitude of cracks...

...let set awhile, and 'clamped'.

The Left Wall:

Tipping the trailer away from the varnished side helps the thinned varnish penetrate