3 pages. Was there a real answer for the OP in there somewhere?
Look, unless you're running near max current, you could get away with 2-3 #8 50 amp RV extension cords. There will be a little voltage drop but it wont stop the show.
The "code" option that wont break the bank is to bury 4x #4 wires to a box on a pedestal. The would go in the ground and out of the ground via pipe but can be buried loose. I cannot recall the required depth, but its in the 24-36' range.
But unless this is a permanent location, go with the extension cords. You'll save a ton of time AND money while maintaining full functionality in the camper.