More stable gathering trailer

A gathering trailer, comprising:

• an upright rod assembly,
• wherein the upright rod assembly comprises a first upright rod, a second upright rod, a third upright rod, and a fourth upright rod, a top and a bottom of each of the first, second, third and fourth upright rods being fixed with upper fixing members and four lower fixing members respectively, and the first, second, third and fourth upright rods being externally covered with middle movable members slidingly cooperating with the first, second, third and fourth upright rods;
• left-and-right contraction adjusting assemblies are provided between the first upright rod and the third upright rod, and between the second upright rod and the fourth upright rod, as well as between the second upright rod and the fourth upright rod, respectively,
• the left-and-right contraction adjusting assemblies comprise a first left-and-right adjusting lever and a fourth left-and-right adjusting lever cooperating with the upper fixing members, and a fifth left-and-right adjusting lever and an eighth left-and-right adjusting lever cooperating with the middle movable members,
• a sixth left-and-right adjusting lever and a second left-and-right adjustment lever are sequentially provided outside the fifth left-and-right adjusting lever;
• a seventh left-and-right adjusting lever and a third left-and-right adjusting lever are sequentially provided outside the eighth left-and-right adjusting lever.