Before you go too far, I suggest you visit a full-service propane shop and get an estimate. I suspect they'll have the tools and expertise to do this without dropping the tank and it might not be too expensive. Even if they have to drop the tank the cost might not be as high as one might expect. There's no downside to asking.
The worst outcome would be for you to break something by trying to DIY it.
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Bob
2005 E350 Super Duty Ext Wheelchair Van
2002 Itasca 35U Motorhome
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