big,
I just checked my driver side sill and found it bone dry.

I live in Ontario also so we've experienced the same winter weather and my truck has the WeatherTech mats as well.
Do you have mud flaps?
Mine does, they may be helping somewhat.

 

Ya, I have mudflaps.

First mod..!!


I think its just from melting snow from my boots....Its just a bummer it accumulates in the sill like that.

I'll fix it in the spring.

 

Big G

This might sound dumb. But maybe you can put a towel or a rag in the tray to step on. So it can catch all the crap from your boots.. This way the water/snow wont travel down to the sill and when it's really wet you can replace it with another.. It's just an idea.. GL..

Nick,

 

Very interesting post. Did you let your dealer know about this issue? If so, what did they say?