Be aware that the so called rock guard can possibly create more rock damage to your toad then without it. Because of dips in the road and the great overhang of the rear-end, the rock guard will scrape the road. Without the guard, there may be a pebble laying on the ground and the RV simply rolls over it. However if whacked at 60 mph by the guard, it takes off, bounces and may hit your toad's windshield.
With my as delivered rock guard, I would always find gravel laying in the gutter of my toad's windshield (by the wipers). I kept cutting off the rock guards bottom rubber and even had to raise the metal FR logo, until the gravel stopped.
Another problem with the guard is going up an incline like a driveway where the RV's rear end presses the guard into the ground and the guard mashes into the exhaust pipe. This also can happen when the air is let out of the air bags when deploying the jacks. This often happens when backing into a camp site with the back end hanging over a ground incline, rocks or even a railroad tie. Believe me, I been there - LOL
Gale & Hank- 2012 Berkshire 390BH