a hill is good for a colicky horse. you can walk the horse up and down the hill, to get the gut to move , stand up hill , then stand down hill, i have done this with a gas colic and it helped move the gas so the horse could expel the gas. i would stop and listen to the gut, if standing down hill made more noise we stood downhill more often.
Another thing I have done for a colicky horse, load into a trailer, seems to make them poop.
That is an interesting photo. that ramp looks a bit steep, maybe it the angle of the photo. Thank you for sharing .