i have a 2004 2wd scab 6.5ft bed and when i accelerate about 1500rpm for a complete stop, the bed of the truck or the rear i should say shakes. now i still have stock tires on there and their getting kinda bald, could the shaking be that the truck just cant get traction cause theres no weight on the bald tires? please help thanks guys

 

They may be out of round and out of balance.

 

well i plan on gettin new ones soon so ill see

 

If it only shakes on acceleration, check the u-joints in the driveshaft.