The 'best' way to address those creases is by removing the inside panel and work them out from the backside - although, they will never 'disappear' unless you replace the panel. It looks like this trailer has been sitting awhile and may need some pretty significant work prior to being 'road-worthy' and 'camp-ready'. Have you seen the interior? If the windows have been left open - there may be water damage to the floor...which is a big issue.
This website, can help you assess the condition & what the price should be.
Good luck regardless if you decide to go for this one or look for another!
Shari
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