I recalled last night something about a cabin in the area - that burned down.
It seems to moo possible that BM chopped up his wife (disambiguate?), put her into bags and drove off to find a good place to dump her - like I’m a dumpster that is emptied regularly and the contents trucked off to some remote garbage pile. A land fill?
That's why no traces of poor Suzanne have been found, no tattered clothes nor scents for the dogs to follow.
I think he chopped her into pieces at that cabin and packed her up to go. That's why they found nothing at the house or jobsite. He probably had already pre-stocked the cabin with cutlery, rags, bags, boxes, tape, cleaner, etc. He probably worked naked to avoid blood-stained clothes. (It was late May)
Later, burning down the cabin cleans up any overlooked traces, smears or smudges.
That's why BM can sell the house with worrying about leaving clues behind to be discovered. That's why BM isn't worried his kids will find something incriminating.
"Cummon, Honey! It's mother's day! Let's celebrate! I know a romantic little place just down the road!"