used goosenecks of sufficient capacity can be had around here for $2500-3000. The big ones with tandem duals are a bit more but still very reasonable by comparison with new. I hauled a "58 C60 Viking on a trailer I found by the side of the road for $800. Once you zero in on finding a good used trailer it's kind of like these old Bolts- they are everywhere that you never saw them before. Also contact your local farm implement dealer. Many of them know of private contract haulers that haul tractors and implements using a pickup and gooseneck rig to avoid road taxes, etc. Fees are still about $2-3 per loaded mile. Sometimes you can find a trucking company that is deadheading a return that will haul for a negotiated price just to avoid being empty. Good luck
