Rear windows keep breaking

You are already busting tempered glass windows back there. Plexi will break in it's due time in the cold. If thick enough it will take alot of rocks.

Buy the wheel fenders. Nothing fancy, if you are in a land of rocks probably cheaper to bolt on replacement.

And be careful digging your drives that violently into the rocks.

 

Maybe try some half fenders or quarters and see if it helps

 

Are you pulling a belly dump , dont understand can't see trailer issue.

 

2 minutes of searching. Under $400 for a pair:

 

Do it right, put a set of fenders on. Poly ones can be cheaper. Used ones also come up.
Anything else is a waste of time and a temporary bandaid on the situation

 

Fenders then. How much have you sunk into windows. 400 should not be a issue one time.

I usually threw shale rock off road in our ridges that have full of them. But the mixer had steel plate over the top of drives and on ends of them. That rock aint going anywhere. I might fall off the mountain but thats not anyones issue but my own.