You have said 3 jacks. I have never seen a camper with three permanently attached jacks. I have seen the tripod jacks used to lift a camper off a truck, two on one side and one midway on the other side, but never three electric jacks.
A friend of mine with a dually bought a Lance several years ago, it was on a SRW when he bought it. Since it was local, the seller took it to his house and offloaded it. He used rectangular steel tubing as spacers to move the jacks out when they were swung out. I wished I had bought that camper from him. He sold it cheap and the co-worker who bought it let it sit and eventually gave it away.
Charles