Could be the diferance in suspenshion sys, I have never seen a picture of a tracked Vehical from WW2 that had a list, the torshion bars are still putting preshure on the ground wheather or not the track is conected or not, look above no list in that pick.
A Tiger I has a ground pressure, with combat tracks 72.5cm wide and a footprint of 361cm, of 1.04 kg/cm^2. Remove the tracks, and all the weight is being borne on the 75mm road wheels. There were five 'lines' of road wheels, each line of which would have a ground contact of about 1/4 of the footprint. So, when a track comes off, the support area changes from 2.62 m^2 to 0.338 m^2 -- increasing the ground pressure by a factor of more than 7.7, to 8.04 kg/cm^2.
An advertisement for a tracked Bobcat skiploader describes how, with its ground pressure of only 3.8 lb/in^2, it will only sink 6-8 inches into mud that's 10-15 inches thick. The ground pressure of a Tiger 1 with combat tracks is four times that; the ground pressure of a de-tracked Tiger 1 is
thirty times that.
If you look at the picture above, the Tiger is sitting on a metalled (i.e., concrete) road surface; this has
many times the resistance to pressure that open ground would have, which is why you don't see the tank listing.
Of course, you
could just come up snake-eyes on your luck roll, and wind up
seriously tilted: