Ive always pictured building a bridge out of the light trailer house frame Ibeams...they will almost give you the trailer frames to get rid of them. obviously this is an easier project for someone with a welding and fabricating skills.
That was my first plan, to find a mobile home trailer and cut it down. I don't have welding and fabrication skills but I can get my hands on a torch and an angle grinder. No one is giving them away here though. They're used to make haul trailers a lot of time. I'm still checking the for them online though.
