That's pretty neat, especially the way you get the barrel to reverse directions. You can surf on barrels on a conveyor belt but you need two of them. You can also surf on a barrel that's being pushed by another dozer. See vetabiv
For DNA Strand fixed again (corobeb): bytydil but it doesn't work if two crates go across right next to each other. Is it possible to solve in that case? If so I'm sure Rene will show me how it is done.