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I've heard bar and chain oil is really good for it. I just got my truck last fall, so when it warms up I'm going to paint my frame and anything else that is a little rusty underneath. Then later on I'm going to try the bar and chain oil
My dad and I do ours ourselves evey fall and spring. My grandpa has a gun he uses that's basically a paint spray fun with no nozzle so it sprays the oil. Its essentially free if you filter and save your used motor oil from oil changes. I was always told by my grandpa that the truck is to spray it then dive down a dusty road and it makes a nice barrier and oil protecting layer and helps so all your bolts and stuff don't rust and freeze up.
That would explain the old ford I had, I thought someone had just fixed a rear main seal before I bought it.. LOL Now I know someone must have oiled the frame, too funny. I may have to try it myself. I prefer to clean, wirebrush and paint my frames but thier way sounds much easier to me.. If not very enviromently friendly.