Then back again over the fields after killing 5 people? Possible I'm sure, think local people have more of an idea about the distance, the state of the pathways and fields he would need to navigate etc.
Just had a look at a map. It is rather far to walk - even if the trailer was situated to make the walk shorter.
We don´t know where the trailer was - it could have been on the other side of WHF compared to Goldhanger.
This is all a bit too convoluted, like the theory is made to fit some "difficult" facts about the case.