It looks like a drop tank used as a carnival ride. You can see the four points where the chains or cables were attached. Sort of like this image from
https://www.pinterest.com/pin/226728162463129481/:

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To donate to the PV-2D project via PayPal click here
http://www.twinbeech.com/84062restoration.htmWe brought her from:

to this in 3 months:

Help us get her all the way back

All donations are tax deductible as the Stockton Field Aviation Museum is a 501c3 nonprofit organization. Tell a friend as the Harpoon needs all the help she can get.
Thank you!
Taigh Ramey
Vintage Aircraft, Stockton, California
http://www.twinbeech.com'KEEP ‘EM FLYING…FOR HISTORY!'