I've never had a problem with them at all, but our rig stays occupied a LOT. However, first I've heard of it, but another one of my brother in laws rigs had the mice chew through his Pex tubing. That's the first I've heard of that one.
John and Rebecca Dickson
Emma-8 / Little John-5 / Iva-1+
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)