Sand Man (SA) posted:

Spot on Duncs.

I experienced a rear window breakage a few years ago while towing a trailer up the Birdsville Track. The trailer had a stone guard attached to the A-frame but a small stone about half the size of your little finger nail was all it took. It must have bounced off the frame of the stone guard and was still embedded in the glass.
It even got past the spare tyre which was mounted on the rear doors.

Pete,

I subsequently bought a rear window protector from Obies Outback. I found it to be very good and gave me piece of mind that I would not experience a similar fate in future. easy to put on and remove, being held on by Velcro fasteners.

One small "negative" I will identify and this would happen to almost all protectors attached to the rear glass.
Over considerable time, when travelling on extreme dirt road conditions, dirt or dust deposits will be deposited between the plastic buttons that help maintain a gap between the protective material and glass window. This deposit can cause an abrasive action on the glass where the buttons touch.
The abrasion was very minor, but there all the same. You could notice it when cleaning the glass with Windex, or similar.

The solution is to wash the window, (removing the protector if necessary) as soon as a build-up of dust, dirt, or sand occurs, taking care to clean behind the small clear buttons.

Bill.

madcow posted:

3mm ploycarbonate will also do the same job but is more impact resistant but scratches more easily. Use some velcro to stick it on.

Member - Rod N (QLD) posted:

There are these Towtector or here for other ideas Camper trailers - stone guards