What is the best way of placing axle stands on a 2010 C5 hdi, when I lift the C5 to its highest point I am unable to place the axle at the correct points I still need 50mm in height I have access to 2x100mm solid timber ramps, can I drive the C5 on the ramps then lift the car to its highest point put the axle stands in place lower the C5 onto the axle stands or get an extra suitable pice of timber 50mm thick and leave the car at its normal height, that would give me 150mm height in total, any advice would be appreciated, thanks in advance.