We have a 3760 EL Bighorn. The long slide topper over the refrigerator and stove area tends to billow out when driving at high speeds. It's very problematic when we have high winds. We have anti-billowing devices on the slide topper but those don't seem to work. The RV repair place checked the tension on the roller and said it was fine. What ideas do you have on how we can fix this problem. At times we have had to climb up and put a zip tie on the roller to prevent it from billowing (not easy). Thanks!