I too grew up on a farm and believe me, scalding is the ticket if you want something edible, after skinning.

Try to find an old fuel tank, 300 gallon and cut about a 4th out of it. You can find them that have rusted out on one side and these work fine. Be sure to wash it out. We had one on skids but a trailer is even better. Rig a burner underneath, a length of pipe with holes drilled in it, a regulator and tank of propane. Fill about 1/3 full and heat water to about 200, useing a fryer thermometer.

We had a large frame built that would hold a 400 pd hog, or more. Lifted the hog with a winch, pulled the tank underneath, dipped, lifted and scraped. You'll need water on site for rinsing. You can buy large, heavy-duty bladders that will fit into a p/u bed and a dc pump. We have a rig like that for firefighting that will put out between 40 and 50PSI, carry over 100 gallons of water but a real thrill to drive!