Medium. Rides really well. but drops like a son of a bitch when I load the excavator onto its trailer even with stabilizer arms out.
But when I get the canopy I might put in the helpers to beef up the rear end with the extra weight. I have a mate who also has airbags on medium springs as well. He isnt that impressed by them and wants to take them out. Might get them cheaper LOL. And give them a try first.
Mark