Bansh-eman,I was letting air out, thinking that more surface area against the sand would give me more traction,Then I read a couple of posts on Planet Sands about adding air in the haulers causes the paddles to be stiffer and not fold over as easily.It really works, even at The Clash of the titans in Sicily Island where the sand is the fluffiest I have ever seen, it picked up the 300' time on my son's bike.