They are definitely not heavy duty (very cheap cast aluminum with a screw adjustment where the nut just sits in a octagon hole in the top) I use them in conjunction with my electric stabilizers jacks. I place one pair between rear stabilizers and rear tires and the other pair goes four feet forward of front tires. I just snug them up to the frame. I have to stack up (4 to 5) 2" x 8" x 8" boards for these jacks to reach the frame. Rocking has really been drastically reduced, but not fully eliminated. Having to haul all of these 2" x 8" x 8" boards to put under the jacks where they will reach the frame is the biggest pain.
2015 Rockwood Windjammer 3029W Diamond Package
2014 RAM 2500 Laramie Longhorn 4 x 4
6.4 Hemi 410 HP, 410 Rear Axle