Larapinta trail

Planning on a Larapinta walk late July. Just wondering if anyone has suggestions of secure parking somewhere in Alice for duration of the walk? Have looked at the long term parking option at the airport but it is ridiculous.
Information for bushwalkers from bushwalkers
https://bushwalk.com/forum/
South_Aussie_Hiker wrote:Perhaps a BW.com member would be able to keep your car at their place while you walk?