Undiagnosed vibration

I have a 19’ tundra I’ve had since 0 miles and a few years ago I noticed a slight vibration with a wheel shake that comes and goes and gets worse. And it’s impossible to replicate, it has a mind of it’s own. So I haven’t taken it to dealer for them to pay me and say nothings wrong. It’s there 100% of the time towing. From my 19ft boat and trailer to an empty utility trailer that weights nothing. Also when accelerating it can happen but normally doesn’t. It was definitely worse on my old tires, couldn’t tell you what they were. But it’s definitely improved with the wild peak AT4s I have now. My thought right now is something’s loose. Or I have those god awful steel wheels that I know are a pain to balence. My have atleast 2 or three jumbo weights on each wheel.

Edit: forgot to mention I just hit 73k miles and just had brakes rotors and front calipers replaced.

 

The next time it happens put it in 4HI and see if it immediately stops vibrating.