The first method is to use the tongue jack to see-saw the trailer to raise the front or rear depending upon what you want to do.
The second method is a ramp. This can be out of blocks sequentially stacked. Sometimes the car ramps will fit as well and they are a bit more stable.
If you use one of these methods, make very sure that you have wheel chocks in place and the trailer is securely in place.
If these methods don't get you enough lift, you will need a hoist. This should lift the wheels. If you can't hoist the wheels, then you need to be very careful about jack placement and frame support.
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