We have a lexan rock gaurd on the front of '99 Patriot Thunder. I believe it came from the factory equipped this way as one of the photos on the '99 brochure, shows the coach with this exact setup (See coach assist, brochure pages for '99 Thunder for a picture).
The guard is made by Summit Products Inc. (800) 329-2958. I personally like the gaurd and don't mind the "look". Some people don't like it and have changed to a 3M film product. I've heard there are a bunch of problems with this film causing damage to the painted surfaces of the coach, but you'd have to ask others about that.
Anyway, there are NO nicks or dents in the front of our coach. From what I've discussed with other RV'ers - I would not consider heading to Alaska without something like this heavy lexan shield. Cleaning behind the shield take a few extra minutes, every now and then, but no big deal. It hinges so you can tilt it and reach all areas pretty easily.
In any case, the current version (older shield can be updated) include four "push to release" pins that allow you to quickly open the generator bay. So instead of unscrewing four hex head bolts (5 mins) you can just push the pins (30 seconds or less) to get the shield to slide out with the generator.
I did not upgrade to the pins, because I felt I could spare the extra few mins (10 or so including removing and reinstalling the bolts) and was too cheap to spend the $20.00 ea on these new style pins at this time.
Summit Products have been really nice to work with when I ordered parts, etc. They are at many major RV shows.
J