Those are dune buggies. In Dakar and cross country rallies, these are called buggies (by everyone, not just by me):
As you can see, they're closed and have windscreens, but they're still called...
For me Buggies are either for pushing young children in and built by Maclaren; or they're a bit bigger for a few adults, powered, and found on the beaches of 1960's California, the moon or a golf...
Actually there are at least 2 disciplines to see any kind of prototype racing: hillclimb and gymkana/slalom. why turn rally into it?
WRC mainclass from 2027