Having an area that is time consuming = dangerous to get to is both a perk and a pain for the guilds there.
The reasons are clear, it makes it a dangerous area to escape from (unless you have a teleport/flying steed) which the goodies don't have much of. But attacking VK or the Spur is arguably more dangerous since you can get locked in.
I would suggest do the following to balance Neraka a little bit.
Make killing the trolls in Neraka trigger the town protectors being aggressive towards you kind of silly they don't already.
This oversight/feature currently lets people move between camps and to and from the town without worrying about dragon attacks.
If the town is aggressive towards you they also send word to Sanction and BDA guard attack on sight and don't allow you to pass through.
So if you want to go through Sanction you have to take the other wagon, but sanction is also dangerous as the town is aggressive against you too.
Make the wagons a little faster, like half the time?
Or make it possible to jump out of the wagon, sort of like the way you could jump off the griffon and land in Icewall.
According to the Genesis atlas there is nothing between Neraka and Flotsam.
But the wagon takes such a round about long ass time it is reasonable to assume it is going on roads that pass through other places.
So make it if you jump out you could end up in the war plains far south west of Kalaman, or in Icewall or Kurinost.
Icewall is a little bit of a detour sure.
But the gameplay factor is make it somewhat unpredictable where you end up if you jump out.
And possibly more dangerous to jump out than stay in the wagon being attacked.
For the Wagon to Sanction going out would put you somewhere on that road.