I refer to your website picture caption "Double side cantilever racking for storage of long lengths of timber". I notice there are guide tracks for the material handling truck ( I believe it is a side loader). It is almost like a VNA racking system (correct me if I m wrong). Do you need the floor to be super-flat?
The arms of cantilever racking are slightly declined from outside to in, however the floor still needs to be fairly flat. It is not the same as very narrow aisle racking. Cantilever is specifically designed to store long lengths of materials, not pallets.