The rules (Ref's Guide p 14) tell us that if the PCs make camp & remain in camp for more than one shift, we have to roll on the stationary encounter table once per shift, and for each shift we remain stationary, we have to add a +1 DM on that table ... which means that after 7 shifts in camp, i.e. on the second day, a large force will inevitably show up and demand our surrender. And if we beat them off, then an even larger force will show up ... on the next shift, i.e. the end of the second day.
So, given the time involved in brewing fuel (if we have a still) and in scrounging for repair parts for a broken vehicle, the PCs are more or less hooped when they run out of fuel or when they have a breakdown.
This seems ... broken.
1. how often should stationary encounters really occur? Once per shift, or once per day? Should they at least be limited to daylight hours?
2. how should the location of the camp -- on or near a main road, vs. tucked into a concealed hide well off the road -- influence the chance of an encounter occurring at all?