Lazy Daze Owners' Group

While not made for a caddy, a rock shield, like the one below, could be adapted to protect your toad from SOME of the damage. No shield is perfect or complete, except for an an enclosed trailer.
Amazon.com: Guardian Rockguard Shield: Automotive

On gravel roads, rocks, thrown by passing vehicles, is a major cause of windshield chips and shields cannot deflect many of them because of the angles rocks approach at. Covering the windshield can cause the same type damage the bras do to the paint.
Many used a fabric shield, with good results, add one to the shield for the best possible coverage.
Roadmaster Inc. - Tow Bars, Braking Systems & RV Accessories

 Consider the toad's windshield to be a wear item and it will need periodic replacement.
Heck, the LD's windshield is a wear item, it has been clobbered many times. A new isn't all that expensive and having a new piece of glass can be a joy after dealing with a badly worn windshield, driving into the setting sun.

If I bought a new LD or tow vehicle today, I would consider getting the front end)s) done with 3M's clear film treatment. I saw a 12 years old LD, a few weeks ago, with near perfect paint. It had been coated when new. 

There are two schools of protection. The first ignores the damage and doesn't go through the hassle of dealing with shields, a few dings and chips are expected. Our Jeep fall into this category, and it fits the vehicle's image.
The other school goes for protection, usually driving newer or better looking vehicles. Many start out this way but quickly switch to the first school. 
Do yourself a favor and not tow a vehicle that you are in love with it perfect looks, heartbreaks are almost guaranteed.

Larry