Truck or Trailer Shake at 0-30 then again at 60mph?

Trailer is air ride. Shocks on the trailer are shot. Going to hook up to another loaded trailer now to see whether truck or trailer

 

Did have them balanced 2 days ago and still same thing unfortunately

 

It doesn’t really do it much when empty. I’ve checked it bob tailing and didn’t really notice it. I thought I did maybe for a few seconds but could’ve been just the road Convincing me that was it. Hooking up to another loaded trailer now and will update post

 

Update: Hooked up to another trailer and loaded it and didn’t feel the shake. I’m surprised. Been driving 10 years and never had a trailer literally shake the entire truck and cab. So now it’s time to see why the trailer is causing such a bad shake on the truck. I know shocks are bad but I’ve had bad shocks on other trailers and never anything like this

 

Another update - Pictures attached : Unfortunately when I unhooked from the trailer I was using to test if it was the truck or trailer, I hooked back up to my trailer and went to get it washed out so I could take it to the shop. I got washed out. When I started my truck to leave the washout I pressed the clutch pedal and it was extremely stiff. Pulled up and stopped. Went to press it again and it was just as stiff. When I got onto the highway it sounded like a bunch of rocks hitting underneath the cab. I was getting that same sound since this “shake” started as I did today. It didn’t happen all the time but when it did it was usually when I was getting up to speed. 1-45mph . Did happen a few times above that speed. I opened the clutch plate and looked around and don’t see anything to unusual. Some fine metal shaving but not much. Was a heavy coat of red dust. I’m assuming my clutch might be screwed. Yay

 

Here are the photos