I have some similar devices made by BAL that I put on our HT 29.5 FBDS. I put two on each landing gear leg and one on each side of the rear electric stab jacks.
The biggest concern was potential interference with the spare tire at the front under side. But I was able to drop it a bit, push it back and crank it back up for enough clearance.
They seem to reduce the sway, but the trailer still wants to shake a tiny bit when someone walks about the trailer.
FAA licensed A&P aircraft mechanic, ex-RV dealer parts dept
Retired B-52 Gunner/Flight Examiner, B-52 Crew Chief
2016 Jayco Eagle HT 29.5 FBDS w/ 15,000 BTU AC, 50 amp service, upgraded counter top, thermal pane windows, elec. stab jacks, outside grill, backup camera and MORryde pin box.
2011 GMC 2500HD DURAMAX/ ALLISON