Yes, I bring mine into the garage and keep on the top of a few pressure-treated boards. (You never want to put batteries directly on concrete.) Three reasons:
-Batteries and propane tanks have a high-rate of theft in RV storage lots....only takes a few minutes for thieves to gather up a LOT of them.
-It can get -20 F here and I take turns plugging each battery in to my battery tender during the winter.
-I also get the propane tanks re-filled in the winter so when we start camping in the spring tanks are full and batteries are ready!
Rick & Karen
(Retired USAF, MSgt)
5-year Travel Trailer RVers
2013 Forest River Rockwood Ultra-Lite 2904SS
2014 Toyota Tundra Maxcrew SR-5 TRD 4x4