Here's a slightly amended process I used for the trip through the Oberslecht to give that part of the adventure a bit more clarity and to help ensure eveyone gets involved in that section....you might find it useful or as inspiration....?
Make a tracker 8 spaces long with events on the 4th and 8th spaces, with party token and beast man token on the first space.
Each PC needs to make an easy (1d) stealth check, although a PC can piggy back on another’s roll by adding a misfortune dice to that roll, but meaning the person piggy backing doesn't need to make a roll themselves. This allows the more stealthy members to take the lead and watch out and help less stealthy members.
If any roll is failed advance the beast man tracker
A nature lore check is needed to find a good route through the Oberslecht, if successful advance the PC token by 1 space. By other PCs helping with this, extra fortune dice can be added as normal.
Finally, a simple (0d) strength check is needed to move the cart through the Oberslecht unless the nature lore check failed, in which case it is an Average (2d) strength check to move the carry forward. If successful, advance the PC token 1 space. Again other PCs can assist as normal.
Add a misfortune dice to each extra task (including aiding another) a PC makes in a round, so being stealthy and moving the cart (even if just assisting someone else), for instance, would acquire an extra misfortune dice for the strength check
Advance the beast man track at the end of each round.
If PC token reaches first event space first, the can see the camp through the trees, add a fortune dice to all subsequent PC rolls until the end of this act.
If the beast man token reaches the first event space first, then the beast men have picked up the scent, increase the difficulty of all stealth checks to average (2d).
If the PCs token reach the last event space first, they have reached the lighning stone clearing, if the beast men token reaches the final event space first, the PCs are ambushed as per TGS.
If the party make no attempt at stealth rolls the PCs are ambushed as per TGS.