Mud flaps or tow guard for Vista?

I had both mud flaps and a tow guard on the Winnebago and pull a jeep. I was getting some rock chips in the paint and the windshield was showing fine specks in it (like sand had been hitting it). I took off the tow guard and I don't think I am getting any damage now. It did seem like the jeep was getting dirtier but I drove in some pretty sloppy conditions. This is the first trip without the tow guard so I can't judge for sure but I think the tow guard was stirring up rocks and sand from the road surface. Just my observations so far. Good luck with your choice.