I think I missed something - early on in the investigation, even before NG mentioned the $40,000, there was a girl living in Florida who said she was a niece of the S family. Did anyone ever figure out how she heard about the $40,000 before MSM?
I have this crazy theory that DW was coming back for that car and they were heading down to Florida, where there are a lot of races year round. If I was going to steal a Moser, I would put it on a shipping container to China or Saudi Arabia ASAP, but I think a prime suspect had delusions that he was going to race it.
I think the Amerit trucks come with a mechanic. I don't think you can just rent one like a U-Haul. Who/How/Where did DW's clan obtain one of these trucks? Also, fleet mobile service trucks are marketed to Semi-trailer/bus/etc. companies, but I've seen similar mobile garages at race tracks.