We have a Cayman Classic. They come in 2 heights: 1.8-2.4m or 2.4-2.9m
The rail on our H2 Relay is just under 2.4m from the ground so we went with the lower height version, but in hindsight, I think we should have gone for the higher one as the tunnel is stretched quite tightly around the sliding door so care is needed when opening / closing.
There’s enough width in the tunnel to open the sliding door as far as the half way stop that we usually use, but a wider tunnel would be better.
It’s quite light and compact when packed – we had an air awning briefly, but the pack was HUGE and it weighed a ton – seems to be reasonably well made and was one of the cheaper options.
https://www.outdoor-revolution.com/cayman-classic-mk2-f-g.html