I would give your sons a deadline to remove the stuff (do they still live with you?). If they don't get rid of it, then put it on craigslist yourself. If it doesn't sell, find someone to haul it away and pay you for it - metal is worth money these days (but you'll get more if YOU cam get it to the scrapyard).
If that doesn't work, put a FREE ad on craigslist or freecycle, bet it would go then.
As much as I love ebay, I don't want to deal with out of state people or shipping large items, so anything like that I posted on craigslist. I would always put a disclaimer of "cash only, exact change only, will not deliver". And on the heavy stuff I always stated they HAD to bring help, as a small woman there is only so much I can do.
I find with craigslist I decide on a price I want, and post it for more as everyone seems to want to dicker. That way I usually get what I really wanted and they think they got a bargain (couple of times I made out better