On Friday, April 15, 2016 at 9:19:36 AM UTC-7, wrote:
Hello to all!
Please for help: how much is the highest height when towing by a car ("world best achievement")?

How about this? up to 1500' the announcer sez. Not unreasonable.
Video link was in a RAS post in 2009:
https://www.youtube.com/watch?v=boqxZ3BOzlY
Adding more rope just seems to give more of a curve to it due to drag.
But with a long dry lake (El Mirage?) and a long bit of something thin like Spectra....
Jim