If that is what she did, she may have killed him before arriving in either of the two towns and disposed of him with other 'rubbish', possibly carpet and the like. If his death had been bloody though it is strange she did not also dispose of the 2x4 in the same dumpster or compounder?
Surely she was not thinking so straight as to kill and dispose of him and still remember to dispose of bloody items elsewhere? Or could she?
I don't even know .
I'm so averse to this woman my judgement is not sound on her possible capabilities, I think cornered rat since yesterday.
It is, of course possible she pre-loaded a large waterproof suitcase into truck night before, stopped, took it out , took him out, killed him, loaded him in the sealed container and dumped him in a compounder, but why then the long drive?