I have a creek that runs accros my property, cutting it about in half and want a bridge to get my tracrtor across. I'm trying to find a cheep way to do this. Near me is a place that is a scrap yard for mobil homes, so I thought about getting a frame from one and then decking it with 2" by whatever planks. Anyone have any ideas about this? The creek is about 20' wide, but I plan on at least 30' beams to shift the load away from the banks.