Tire noise

Has any one had any issue with the r-pod tires sounding like they have a rock stuck in them. We took the pod camping and on the way I hear tire squeal. I thought maybe our truck had a rock in its break. When it's not attached to the pod it's just fine. We jacked the pod up to see if it had any thing in the wheels. Nothing. We did hear a slight rubbing noise on both sides. We're assuming it's the breaks. We'll take it to the dealer, I'm just wondering if anyone has had any issues with the tires, breaks ect. It's only been on the road twice. Didn't notice the noise when we brought it home....