There are many theories about this--I think best is to place wood/plastic between tires and surface. Keep them aired fully--do not let them deflate and bulge out sidewalls. I guess a case could be made for getting all the trailer weight off the tires for such a length of time, by using jackstands under the frame rails.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired