I have the same problem with my high wall. Because the roof is on "stilts" it moves. So when we open the awning, it shifts the weight. We've actually stopped trying to connect the top two stoppers because in high winds the roof moves and you can hear the stress in the door frame.
2014 Stealth Evo 2850- "Woodstock"
2011 Toyota Tundra Rock Crawler TRD 5.7- "Clifford"
2013 Honda Accord Coupe V6 w/Track Pack- "Julia"
Just glad to get away