95 brakes dragging

[slipknoter106]

OK so I can drive fine for short drives Like to the dfac and school and back. But after about 30 minutes of driving its like my brakes get hot and start dragging. Its the rear brakes. Ithink they are brake drums and I hate those damn things and I wouldn't know where to start. Do you think replacing rear breaks will fix it or what?? Thanks any advice d will help. If you want to ask me questions I will

 

[77'911]

You might consider checking, or doing the following:
-flush the fluid out with some fresh and check to see if their is any actuation back there. If nothing is seized in the drum area(ie shoes, springs, pistons), then you might check the e-brake cables. There is also a proportioning valve back there that might be giving issue, but you might start with the afore mentioned items.
It is worth fixing, as the binding brakes are probably killing your mpg. Not that it is great on these trucks anyway, but something is better then nothing.
regards