You might want to consider using a DC ceramic heater.
http://www.sears.com/dc-thermal-dc-t...4&blockType=G4
It will likely not heat your entire RV, but you may be able to generate enough heat in a smaller area of the RV for plants and such.
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Roger and Dawn
Mishawaka, Indiana
2013 Cougar 280RLS / 2012 Silverado 2500HD Duramax/Allison
2001 Wrangler (Moab Rock Crawler) / 2008 Can Am Outlander 400 4x4
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