Isabella combi 625

ldep

Hi wonder if anyone can advise me we have just purchased above porch awning and have tried to fit it today, we have a Bailey Ranger 2001 470/4 but the awning does not seem high enough, the people we bought from said they had a Challenger 520e and it was
ok, can anyone advise me, as we are new to the caravan thing it could be us that are not trying to fit itcorrectly.