is really into this apparently. She has some equipment reviews on her site. It's fairly popular where I live with husky owners because the lower elevations often don't see snow, but on the weekends the Blue Mountains are awesome for snow. People here generally do it with dog scooters and normal ganglines and I haven't seen any of the frame attachments like the ones in the picture you posted.
I would like to try it, but so far when I have taken my dog biking, she just trots along calmly and doesn't seem to have any desire to run or pull. We are getting an urban trail harness from Alpine Outfitters so she can experiment with pulling. I was looking into the pre-manufactured shocklines, but they seemed ridiculously expensive since you could just make something similar from hardware store materials like this