Welcome friezadeathball.
When I buggy in our awesome dunes, I double up my 25mtr lines to 50mtrs and get the kite up into clean air for when riding down in the gullies between
the rises.
Our beaches are really narrow in places and have small bushes and trees along the top of the dunes close to the high tide mark, so I have always used
30mtr lines to get the kite up over them.
I'm on the bigfoot buggy in John's video below.
https://www.youtube.com/watch?v=Rp9LAvN40cs
Modified Sysmic S2 Buggys
7m R1
8m R1 2
11m R1
15m R1
15m Chrono 2
18m Chrono
18m ELF