This may be an old thread but I'll share what I know for the new comers reading it. The best way I know of to junk a flat bed if you have a semi is to pull off all but two tires (if they're good tires pull all of them off, and find two junky ones, or ask a yard that has junk semi trailers if you can borrow two tires to bring then a trailer.) take it to the yard pull your copper and plates if possible and anything else you may want but needed on for the trip, pull off your two exposed brake drums and weigh out. Take brake drums an wires to where they need to go. If you don't have a semi and all you got is some tools and 1/4 ton truck, start torching the frame into 5' or shorter sections, get the wood off first if there is any. Depending on type of trailer torch cut the whole king pin plate off in one section if you have the means or ability to move/load it whole it saves alot of effort torching it. If the tires are good they can maybe be sold to a recapper if they never had to get patched. Wiring, brake drums and rims are a different price than #1 preparred steel at most yards. And sometimes you can get paid for the tires at a recapping place. Wood is wood, and if you got a outdoors wood burner than feel free to burn it. If not try craigslist or a wood recycler. If your a yard owner getting alot of these a shear can do more than a torch with these. A bit long winded but all im doing at the moment is sitting in a state truck watching the sunset, so im a bit bored and the OP asked for it.