Depends on how much time/trouble it would be to consolidate in time for that last mile. You could expend more effort combining things, than you would save in j

Depends on how much time/trouble it would be to consolidate in time for that last mile. You could expend more effort combining things, than you would save in just doing the last mile in separate trucks. I'm not saying this IS true, I don't know. Just that it is logically possible. Combining two different systems for a last mile delivery is not trivial.