Vibration at 60 MPH?

I had tires balanced first, helped very little was able to go a bit faster before vibration starts, did alignment now I can do 63 MPH before it starts, they checked wheels, not bent. Very strange, I checked all bushings and joints for anything obvious and none, all average wear with nothing looking bad. The ride is soft but I feel it is bouncy, but these have air suspension, is it possible bad struts can cause that?

Am going to put it in the air on a lift and see what I get when all wheels are turning.

Put it up and turned and checked all things that can be turned. Here are some videos maybe you can see something that I can't.

Yes, actually both axles are doing that due to the reason you mentioned, first I thought they were bent. But if a problem only pops up at higher speeds only then only specific things could be wrong. No play at all at 3-9 or 6-12, that is the first thing I checked, nothing at all on all 4 wheels. And it had alignment and balance, very strange, and not a drop of oil anywhere.

I took it to a local OK store that sells used tires, I deal with then a lot. They balanced it and said it had none on the wheels on front. I only did the fronts. I will take it there again. Its more in the cabin itself not the steering, maybe 10% in steering rest is in the whole cabin shakes

So, I told the tire shop to remove the rear and check them. They said they are seeing some upper movements while balancing them, also some minor wear on inside, so I said let's just get need tires. They did not have them so I had it come back the next day, but they said let's put the fronts on back and back on front and see till tires get there. Wow the vibration is much worse, like I can't go over 35 MPH. Next day went and got tires replaced, turned out one of the wheels had about a liter of water inside it, that is why there was vibration. Replaced 2 tires and all is good.

Maybe it was dead flat and was raining and someone just inflated it without paying attention. Ya sane here, I knew it had to do with tires, but never had that much vibration from balance before so I doubted it.