The answer to the Op's question here will vary based on how well you know your area, how hard you feel like working, and your ability to not care what others think of you. As well it also depends on how wasteful those around you are. In Ft. Hood I once pulled out a brand new gun safe that had been returned for something petty and useless. It was so heavy I had to pull it out with the truck, then take it by hand and load it from the top of a 40yd box down onto my already half filled pick up bed trailer. The best thing i found scrap wise was when my truck was brand new i saw a bunch of I beams a union jobsite dug out of the ground. The dumpster was filled with metal and concrete slabs. I was able to get out 2,000lbs of heavy steel beams. Sold for $5/100. There was still about 20,000 lbs more but i couldn't unbury it. After that container left the site switched carriers to one of those single stream recycling guys.