The owner of the trailer -- a woman named Angel Alger -- purchased the lavish trailer for $50,000 in June and agreed to loan it to Lifetime producers during the filming of Lindsay's Elizabeth Taylor biopic "Liz & Dick" this summer.
The trailer was filled with priceless memorabilia from when Liz Taylor used the trailer herself -- while filming "Cleopatra" in 1963 -- but when it was returned to Alger after filming, she claims the thing was TRASHED.
According to Alger, the trailer was covered in cigarette burns, dishes and glasses were broken, and several priceless antiques were missing -- including an old European rocking chair and a French telephone.
Alger told CNN she estimates the damage to be around $100,000 -- and when asked who she thought was responsible ... Alger said Lindsay Lohan.
Alger admitted she had no proof to back her accusation -- explaining she jumped to the conclusion simply because she was told Lindsay and her friends had regular access to the trailer.
Now, Lindsay's rep Steve Honig is firing back, claiming, "Lindsay had nothing to do with it. It's an absurd story."
Alger says she wants the missing stuff returned, and hopes to repair the rest so she can put the trailer on display.