I filled my platform with closed cell expanding foam to take the ''ping'' out of the tubing..... I wish i hadn't done it. It is noticeably more quite but still makes a lot of racket with metal to metal. It added very noticeable amount of weight. This platform will be the backup or loaner. I'm going to make another just like it and go a different route... My question is are stealth strips all they're cracked up to be? I saw they have 3x30 pieces at $5.50....2 of those should cover everything minus the top (standing surface) which I'm going to put grip tape. Grainger has a roll of adhesive backed felt 10ft for $8. How thick are the stealth strips? The stuff from grainger can be ordered 1/8 - 1/2 thick. I just learned about the felt rating system that i had no idea existed. Does anyone know the ''F'' rating on stealth strips? The ''F'' rating goes from 1-15 with 1 having the highest vibration dampening and 15 the lowest. Stealth strip doesnt give very much technical info on their website. I'm kinda leaning toward the stuff from grainger.....1'' wide, 1/8 thick, 10ft, gray in color, with an f rating of three for 8 dollars. Any info on the stealth strips or general thoughts is appreciated....and for anybody thinking of filling their stuff with expanding foam i would not recommend it. Not enough gained for the hassle