GC and Hawkeye hovers can have very high ride heights when set to maximum hover power and the weight of the tech is mitigated by either hoverbug or throttled lift. My guess is they're talking about that.What are double height hovers?
Technically the trick works will all hoverpads, but there's still a maximum height each type is allowed. GC being the highest, followed closely by Hawkeye. The beginning of a hovercraft build tips video I did touches on the topic and gives visual examples of each.