Are you asking what to do about snakes or mice in an RV?
If you have snakes, won't have mice; if you have mice, then you probably don't have a snake...
Might expand on your post if you need help.
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