Apollo 6 would test the Saturn V launch vehicle's ability to send the entire Apollo craft to the Moon. It would also test the stress a launch would put on the Lunar Module. It would also measure how much vibration there would be with a Saturn V with an almost full load. The Lunar Module was a test vehicle and only weighed , about 80% of the proper Lunar Module of (). Also, the CSM was only fueled to a weight of instead of the lunar mission weight of .