I have an 07 nbs crew cab with the terrible Beaming problem from 45-60mph. I am going crazy with the vibration that shouldn't be there and am hoping that installing the hydraulic cab mounts will make it tolerable. I know that when i put about 300lbs behind the rear axle, the problem is gone, but who wants to ride around with that in their bed. I didnt realize that this problem occured on the earlier models, as I had a 03 ext. cab 2500 with no beam shake at all. Did you find any resolve for your truck?