I think a pressure washer will be a good bet, after I try Ed's suggestion of pulling a brush head (like a chimney sweeping brush, just smaller) through a few times.... Its pretty rusty in that one area of the frame. Right at the bottom of the upswept "S", behind the cab, where the frame gets taller! Its probably six inches taller, under the bed, than the cab!
I'm planning on keeping it, though! It runs too good, and its a long way to anywhere, from here. This little toyota should get nearly double the gas milage of the **** diesel!
Oddly enough, the frame is the worst rust on the rig! the body and the rest of the chassis seem to be pretty sound... If it is just that one area, then I have it licked. Just a matter of cleaning it out, and flooding it with some zero rust, or some sort of converter that I can get in to cover the inside of the tube... I guess that I'll just punch a small hole, here and there, in the sides of the tube frame, in which to squirt the zero rust, rather than endo and roll the truck a few times to make sure everything gets coated!