I use rotochoks they took almost all of the rock n roll our of our trailer. Only thing left was the little bounce from the tires. For that I got 2 scissors jacks out of a couple cars at the junk yard. I got the ones that need the lug wrench to operate them. I set them up on a 6X8 block just so I dont have to crank them all the way. I stick them right on the forward most spring hanger on each side to support the center of the trailer. I got the ones for lug wrench style because I use my cordless impact wrench on them. This makes quick work of them, and also ensures that should I even get a flat that the impact wont be found under a mountain of******and have a dead battery when I need it.