2003 S10 ON BAGS BODY DEATH WOBBLE

ok here is my deal I have always wanted a mini truck now I got one but the *** I got it from I believed tried to get me killed he told me this was a daily driver I call bull *** its a 2003 chevy s10 regular cab with c notch in the back and a 4 link has f,b,s,s setup driving the truck is kinda like having a the entire body of the bed of the truck wobbling its not in the drive train its in the body im trying to figure this out but im wondering if anyone else has ever had this problem or not   im stumped its ok until about 30 mph but you can get it to 55 if your lucky and be able to drive it but thats tops im not kidding I drove it home at 50mph from where I met this guy wished I would have had a trailer but he didnt tell me id like to kick his a$$ right now but now im stumped besides this wobble the bags seem to work good it had 2 compressors looks like a viair but not sure even what size it is  but for now im using one had to take the other one out doesnt work  on 2 7 gallon tanks need to order a new compressor for sure sorry for the book folks but please if anyone has had this problem please help thanks  

how does the idler arm look. kinda sounds like its bad.  

here are some pix of the setup
http://s595.photobucket.com/albums/tt36/mr_iceman26k/?albumview=slideshow  

http://s595.photobucket.com/albums/tt36/mr_iceman26k/?albumview=slideshow  

Check all the steering linkage and bushings. If all that checks out, get it aligned at ride height and see if that helps. Then start looking at driveline angles to see if the vibration is coming from that  

cant tell from thos pics! have u checked all the bushings n the rear link?
Is it a reverse 4 link?  Kinda looks like it  and my brohter fullsize is set up like that and it wiggles acts like the trucks move but n theory its the rear end moving!

Take some more photos of the rear set up id like to see link bars. Dose feel like more n the rear or the whole truck n general wobbles?  

it looks like an old cando, or kp bolt on 3 link with the upper bracket and link flipped around backwards. Id suggest getting the correct gas tank x member and switching it around the correct way if that is the case. But i didnt feel like opening that can of worms lol. But if you dont wnat to change it up, id start checking parts for any slack  

Put the truck on A lift, and see if the rear axle can move back and fourth.  
<a href="http://s191.photobucket.com/albums/z230/southernslang_2007/?action=view¤t=orangetwinminis-1-1.jpg" target="_blank"><img src="http://i191.photobucket.com/albums/z230/southernslang_2007/orangetwinminis-1-1.jpg" border="0" alt="Photobucket"></a>

is it posible to have one 3 link bar longer then the other.that throw off the rear axel causing thread ware like i think it every 1/4 inch your off you get 15 feet of scup per 100 feet this is for some thing like toe in toe out same applied to the rear you should take it in to have it aligned at a frame/suspension shop this could be causing the wear in the bushing too put it up on a hoist or jack the rear completely off the ground so your supporting the frame only. take you two hands god gave you and shake stuff till find lose bushings etc... too so you can replace them instead of paying  do the same for the front tie rods etc... ball joints etc... any ways sound like some thing has been off a wile and softened up the bushings.  

ya tried to get tires balanced>