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Pop Up Camper question...Think you can help us out? - used pop up campers in texas

In the past month using a 98 Rockford Camper has bought. We just had one and had problems. In the first place. We bought from a dealer ..... was open when we went to fetch .... and showed us just how close it .... But we have not learned how to open it. So, when we return, we opened and it looks good. We have completed and closed and has brought our first trip. In the area of land that had problems .... We do not shut the door ... Scrape the top ... We nocticed was not straight ... We were in a flat area. My husband supported, and closed the door. But we had a difficult time opening the door and not in the area ... It seems that the elevator in a very poor condition, broken or something. Anyone who knows anything about how useful the camper?