It depends on which ladder and where they attach, some come down further than others.
This picture will give you an idea of the clearance, but let me know if you need more accurate measurements.
https://www.aulro.com/afvb/images/im...015/07/378.jpg
This type of ladder would fit, as long as it doesn't stick out too far at the bottom.
https://www.aulro.com/afvb/images/im...015/07/379.jpg
One that sits higher like this would be no problem, and the dual carrier bar can be used as a step.
http://assets.config.landrover.com/v...6_stc50417.jpg
Cheers, Murray

