My Tiger will get some time outdoors, but mostly at meets as there really isn't anywhere to run outdoors round where I live, and I built my Tiger more as a model with RC capability, rather than the other way round. I'm experimenting with effects to get a muddy look and still remain functional.
Most pictures of Ardennes tanks i've seen the tracks aren't very muddy, not with clumps, as I imagine the ground was probably very hard and frozen.
Your KT's 'weathering' is awesome. I would be forever paranoid about running my Tiger about too much outside. Its definitely not a battler! lol
Cheers,
Rik