[Pamela]

Limey, you are quite right. The jacks are to steady the trailer, not to bear much weight. You have the levelling procedure right also. Left to right first, then front to back. I use a four foot level for mine, but my trailer is much longer than yours. In your case, by eye will likely do, but if you find the drains not working properly, adjust as needed.

Ramps are probably not needed unless you are parked on a hillock.

Oh, almost forgot. you must block your wheels first! Otherwise the trailer might well roll away on you. I use plastic wheel chocks but a large brick or even a rock will do. Put something hard and flat, such as a paving block under the landing gear (trolley wheel) if not on a paved surface.

Youtube should have many helpful videos on the subject of camping. I recommend it highly.