IMO if the trailer weight is being supported on rubber tires, you will always have some motion. My solution (for a 5 month stay in FL) is six large wooden blocks (about 12" square and 18" long). Two go under the front landing gear so the gear does not extend so far. Two more are placed ahead of the front axle, and two behind the rear axle. I place screw jacks from CW on these blocks directly under the frame. I made 4 brackets out of "C" channel and steel pipe to prevent the small head of the jack from slipping off the frame. I leveled the trailer and then cranked up the screw jacks as tight as I could by hand. Then lowered the rear stabilizer jacks and put the tripod under the king pin. You can still feel the washer on spin cycle, but normal walking etc causes almost no movement.
Central New York; 2016 Rockwood 2604WS travel trailer
2014 Ram 1500 Laramie Eco Diesel; 2002 Harley Heritage Classic