Drained my 1992 not too long ago. Disconnect the hose from the filler, right underneath the truck, and siphon from there if there is an anti-syphon prevention device in the way.
Have your gas cans lined up, whew, it'll come cooking out of there. I use a garden hose, put it in the tank, and in the container, then get my compressor out, and pressurize the tank by putting the air-blaster up to where the hose comes in, and sealing it with a rag, then blasting air in there. Gets the syphon going double time and no nasty sucking on hoses.
jon