My .000000002 worth.....
Dipping will get ALL the rust - inside and out... that would be very hard to say/do with blasting it...
I wouldn't recommend dipping a car body... only because of horror stories about paint going away "later" when some acid was left in a seam etc... but then again - I think I still have soda in my dash from when the body on my Nomad was done! LOL
Blasting it clean will strip all the rust and make the surface ready for some paint --- and if I was doing it that's what I'd do... then I'd get a spray nozzle that will reach into the frame and I'd shoot that full of POR 15 to seal it up.
SIMPLE GREEN works real well (get it in gallon size at COSTCO) for degreasing and is "bio degradable" (yeah right...) and I'd be using plenty of it - real strong - on the inside of the frame rails etc to get it so paint will stick.
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