If you use mouse traps and do not check them DAILY you will have even a worse smell from the decaying mouse.
And 'that' smell can NEVER be taken out of an RV. Been there done that when I went to buy a TT. Owner tried everything and could NOT get the smell out from a dead mouse left in his TT. And it really stunk you couldn't spend more than a second in this poor guys TT.
Putting mouse poison under and all around the outside of your RV is really the only way. Double up 'around' AND 'on top of each tire' and anywhere else your TT touches the ground. Bars and small packets are the best.
Buy this product, which is sometimes hard to find, IMHO is the ONLY one that works. Bars and the packets work the best. Check out your local feed stores and/or TSC etc.
Just One Bite

