Just remember that motors do not really like to operate on low voltage. I suspect unless you actually use jumpers from the truck battery to where the RV battery SHOULD be, you are asking to damage the jacks. You might measure current draw and decide yourself.
On my TT the manual warns to NEVER use the electric tongue jack without the TT battery installed.
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Chuck
Wonderful Wife
Australian Shepherd
2010 Ford Expedition TV
2010 Outback 230RS Toybox, 5390# UVW, 6800# Loaded
Not yet camped in Hawaii, 2 Canada Provinces, & 2 Territories
I can't be lost because I don't care where this lovely road is going
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