I have a Rock guard on my Boler - the original fiberglass one that Boler supplied when it was new. It does the job, but when towing without it you can see right through the Boler and observe following trafic - very nice, but risky for the front window. I saw a Boler advertised for sale where the owner had replaced the rock guard with a transparent plexi-glass one. Eureka! An ingenius solution; protect the window and have full visibility at the same time! Here's a pic with the rock guard resting against the Boler - I like it! Alec

That's what was done on Victor's Fiber Stream. The original rock guard was bubbled out, translucent and smoked.

Victor's Rock Guard
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Original Rock Guard
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I had a little trailer that I could see through the front and back windows, while driving, it was great.
It also helped me see what was behind me, when I was backing up !!

Better yet is to make it out of Lexan. Plexi will take 17 times the impact for the same thickness as glass will. The Plexi weighs about half of glass. Plexi will break from a rock impact, however Lexan will not, it will only mark it. Lexan is usually a bit more exspensive than Plexi but well worth it.
When I was doing plastics fabrications I was asked on a couple of occasions to quote on replacing the windows on semi rigs with Lexan when there was a truckers strike coming up.
The strikers would stand on the highway overpasses with sacks of rocks on a rope and smash them into the windows of the truckers who wouldn't go out.

Better still, for a few more $$$, get the scratch resistant Lexan if you can, Benny

You guys must be riding very tall tow vehicles. I just looked through my tow vehicle rear view mirror. It's a 92 Explorer. Only my Burro's front window bottom was visible in the mirror but sure couldn't see anything through it.

So I passed on the Lexan and made my window rock guard out of thin scrap plywood found at Home Depot's junk wood cart, for $1.56.