Safety precautions - he-ruide
Ensure that you are not exceeding the load rating of your jack.  Although you will only lift approximately one half the weight of trailer,  a good rule would that your jack rating is more than the your Gross Vehicle Weight (GVW)

Ensure that you are not exceeding the load rating of your jack. Although you will only lift approximately one half the weight of trailer, a good rule would that your jack rating is more than the your Gross Vehicle Weight (GVW)