cab and bed joining

I have 98 s-10 with a 2.2 2wd and i want to make my bend and cab move to gether and your thinking why, so i can put 15in subs in bed.

do i buy some sort of bushings or what? i would like it if the were not to move seperate at all i don't care that much a boud ride comfort

i would like input from people that have done this maybe pix