I am not new to camping but we have bought out first pop up tent trailer. It is old {1986} but in pretty good condition. It is also small only ten feet. The problem is that when I bought it I received a five minute lesson on how to set it up. I never thought about the leveling part. What is the proper way to level? should the wheel in the front be off the ground and only be supported by the jacks? What is the first step? There are two levels on opposite corners of the trailer, but what a time I am having. On out last trip the door did not shut right, and I am told that it is because the trailer is not level. I wish that I had a manual or something but no luck there. Any help?