Frozen Brakes

you can snip of the heads of the spring nails on the back side of the backing plates. that should let you pull the whole drum with brakes stuck to drum. is there an emergency cable hanging out the backing plate? could have the e-brake on and rusted the cable to housing also. if that dont work you can rent a drum puller from local auto parts stores. get good tension on the puller the smack the drum with a hammer a few times.