Straight truck driving me crazy.

So when I bought my straight truck I noticed an unusual behavior I was on the freeway and my tires literally followed every crack on the road. Especially when I come across a shifting road due to road construction the truck moves from side to side it feels like it's floating or sliding. I did a wheel alignment and wheel balancing but lately it has just been getting worse, now even when am driving on a road that's not as rough the truck does not feel stable, when I hit a bump the steering jerks to the right and I get this feeling in my hand as if something is broken or like two parts are knocking against each other. The truck is bouncing like crazy over the smallest bumps, my kingpins are okay but when I drive at about 30mph there's like this loud rattling sound then it stops and then at 45mph my steering wheel vibrates or shakes really bad. I've been to different mechanic shops and they are saying the truck is fine and I should continue driving until something gives well that something is not about to be my life. So if anyone has ever experienced or encountered this problem before please HELP!!

 

253,000milles
2007 International
i just had the tie rods shock mounts and wheel bearings replaced, I need to go and check if the pin and bushings are tight on the spring shackles and I'll let you know. Thanks

 

It' acts the same way loaded or empty

 

I checked the bushing and they are fine I literally feel like am floating or sliding while am on the freeway, and the bounce on it is irregular, also the truck is tram-lining like crazy I have no idea what's wrong with this truck.

 

Yes I am especially at 45mph